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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 #1100000009091972871 1,190 digits created 2026-08-18

Value

39209355036326028121122081233264560919593221721773126401071938344865027100516802954036190093909240988707900048398714735690387694010050134512866003595725380295092186024370277272435502152780766375292192094534951269379887456158647132404534488974655238696693374555482468026168034600343317489285021344033401529797668860607609446382207376663853674245802874827516580279302703535125280940749292158668519940708193221531293319633703093556051546523665610498523173040012409099679653573760982187585005117420130408091099475712490267350996468935877606568201056924519484207887309528436369228553023528506963921273799429309379275951175627881250814800927192071642147260332896613261159869899478039068557635889939923542705162976471293856811461102922534991959511438026407585629964698202749367853382794882729637710132818937723898418939132761576000207491202736512468319324324745390308880215797008577085963683206382240367786212408615680393475166814404048324915166213947434311855985340282504159574380444516124003986262773703014227441423712523918489333970348395483202862779161184007900431591947321753847252939544676665609722898373904587544691907912108652061226813632236908535899141527105802274955642530523775650629753
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Is factor of

Primality

Certificate chain stepproven prime

Proven as step 75 of the certificate chain of a 2,091-digit prime (169 intermediate primes).

Certified number2,091-digit prime
Certificatedownload
Certificate chainshow step 75 of 169

N-1 and N+1

Checking N-1 / N+1 factorization…

From the command linefdb · curl
fdb
fdb number id:1100000009091972871 --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":1100000009091972871},"decimal":true,"detail":2}}'