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Enter a value, an expression, or a term with a variable like 10^n+1 to list a range. Switch to Database id to look a number up by its stored id. Reading never stores anything; use Create to add a number to the database. See the expression syntax & functions reference.

P · Proven prime
id #1100000008787409456 2,251 digits created 2026-05-03

Value

7155771937579081584723883203156281505371983376624789160439028510237331222424740404466485209830670087774451963149168289587547035872403471576881087424073866360225728036931475222755550879268670242900998521029271238783203929558501452535666138077432918091917576201091672842927566755142988383585265923298968745211410914033367504785795868357845958622315538846139968849881989612962630972295470765307875819870337642279887461131175352596043349754679791477477155059174957668647437655421473322478674313718911407765142281872218669724968457942215455953327043684030456178604462993558566494364607985087098575680752504096142785288681966034392063050728960403426938267824308363004190328926149846001698088172191098508433142747686961078993542838764264539536855231990552721321774043215388022745674589661948860582290573100599248732315427093230743814981227094789306328120054277245382850411181955712228937988359928186070002224161929072032510909961205459032953631335055467558791832365325782288091481562452282332382789578509967750571226618455928251080359072458815247144615710782031744503136282749389946136799438391843042603017090670960644414837550704637151023883535664755324493284699056812526266457439481322834601337425374759767158946126277619963587676689425593042959429863638538654756712549413215317543956793562952357851987098995868842799036357150548455651577745336157654303322656357446523196005074098470028811203326892482540820489964005187645692976925777108371985113208591420362671294408420705768494424167656488788529378582336374889968005379434759970132485578161779103511891754350568348152073522164026000452382485884762236479315701705351677941155055253289264609219955702159719898518809066761495237862992339502372355288973889430336158032275087189512620782003415296844765209981399984381151908781137397644949569463999941159138903882186312325098059673834273560938802875488071458409858755718966455573096888598815341433917079991817220984495726878519129437955697395386919263322584816659740803782642927862330031319283788330268774603614944016521058128072456093978436550428498719277842982961548140939021483034751123666529189247535957441802029692963760040599006632697449359449893167429227706181143319226552844858549248788127112973826664138318764767411483735663957289126722331312658907773
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Is factor of

Primality

Certificate chain stepproven prime

Proven as step 65 of the certificate chain of a 3,261-digit prime (192 intermediate primes).

Certified number3,261-digit prime
Certificatedownload
Certificate chainshow step 65 of 192

N-1 and N+1

Checking N-1 / N+1 factorization…

From the command linefdb · curl
fdb
fdb number id:1100000008787409456 --detail 2 --decimal
curl
curl -s 'https://factordb.com:4059/rpc' -H 'Content-Type: application/json' -d '{"jsonrpc":"2.0","id":1,"method":"get_number","params":{"target":{"id":1100000008787409456},"decimal":true,"detail":2}}'