204069931081 has 9 divisors (see below), whose sum is σ = 216788327221. Its totient is φ = 192058589632.

The previous prime is 204069931063. The next prime is 204069931141. The reversal of 204069931081 is 180139960402.

It is a happy number.

The square root of 204069931081 is 451741.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 154652641081 + 49417290000 = 393259^2 + 222300^2 .

It is not a de Polignac number, because 204069931081 - 2²⁷ = 203935713353 is a prime.

It is a super-2 number, since 2×204069931081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204069937081) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7666311 + ... + 7692883.

Almost surely, 2^204069931081 is an apocalyptic number.

204069931081 is the 451741-st square number.

204069931081 is the 225871-st centered octagonal number.

It is an amenable number.

204069931081 is a deficient number, since it is larger than the sum of its proper divisors (12718396140).

204069931081 is an frugal number, since it uses more digits than its factorization.

204069931081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53180 (or 26590 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 204069931081 in words is "two hundred four billion, sixty-nine million, nine hundred thirty-one thousand, eighty-one".