261122931 has 18 divisors (see below), whose sum is σ = 390643500. Its totient is φ = 168074256.

The previous prime is 261122923. The next prime is 261122963. The reversal of 261122931 is 139221162.

It is not a de Polignac number, because 261122931 - 2³ = 261122923 is a prime.

It is a super-2 number, since 2×261122931² = 136370370188061522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261122895 and 261122904.

It is not an unprimeable number, because it can be changed into a prime (261122231) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9681 + ... + 24818.

Almost surely, 2^261122931 is an apocalyptic number.

261122931 is a deficient number, since it is larger than the sum of its proper divisors (129520569).

261122931 is a wasteful number, since it uses less digits than its factorization.

261122931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34563 (or 34531 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 261122931 is about 16159.2985924513. The cubic root of 261122931 is about 639.1679707132.

The spelling of 261122931 in words is "two hundred sixty-one million, one hundred twenty-two thousand, nine hundred thirty-one".