31136157261 has 96 divisors (see below), whose sum is σ = 52884748800. Its totient is φ = 17452506240.

The previous prime is 31136157253. The next prime is 31136157293. The reversal of 31136157261 is 16275163113.

31136157261 is a `hidden beast` number, since 3 + 1 + 13 + 615 + 7 + 26 + 1 = 666.

It is not a de Polignac number, because 31136157261 - 2³ = 31136157253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31136157211) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 17422810 + ... + 17424596.

It is an arithmetic number, because the mean of its divisors is an integer number (550882800).

Almost surely, 2^31136157261 is an apocalyptic number.

It is an amenable number.

31136157261 is a deficient number, since it is larger than the sum of its proper divisors (21748591539).

31136157261 is a wasteful number, since it uses less digits than its factorization.

31136157261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2039 (or 2036 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The spelling of 31136157261 in words is "thirty-one billion, one hundred thirty-six million, one hundred fifty-seven thousand, two hundred sixty-one".