31596881 has 2 divisors, whose sum is σ = 31596882. Its totient is φ = 31596880.

The previous prime is 31596857. The next prime is 31596883. The reversal of 31596881 is 18869513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30195025 + 1401856 = 5495^2 + 1184^2 .

It is a cyclic number.

It is not a de Polignac number, because 31596881 - 2²² = 27402577 is a prime.

It is a super-2 number, since 2×31596881² = 1996725777856322, which contains 22 as substring.

Together with 31596883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31596883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15798440 + 15798441.

It is an arithmetic number, because the mean of its divisors is an integer number (15798441).

Almost surely, 2^31596881 is an apocalyptic number.

It is an amenable number.

31596881 is a deficient number, since it is larger than the sum of its proper divisors (1).

31596881 is an equidigital number, since it uses as much as digits as its factorization.

31596881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 41.

The square root of 31596881 is about 5621.1102995761. The cubic root of 31596881 is about 316.1414237720.

The spelling of 31596881 in words is "thirty-one million, five hundred ninety-six thousand, eight hundred eighty-one".