31656929 has 2 divisors, whose sum is σ = 31656930. Its totient is φ = 31656928.

The previous prime is 31656923. The next prime is 31656931. The reversal of 31656929 is 92965613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15840400 + 15816529 = 3980^2 + 3977^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31656929 is a prime.

It is a super-2 number, since 2×31656929² = 2004322307422082, which contains 22 as substring.

Together with 31656931, 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 (31656923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15828464 + 15828465.

It is an arithmetic number, because the mean of its divisors is an integer number (15828465).

Almost surely, 2^31656929 is an apocalyptic number.

It is an amenable number.

31656929 is a deficient number, since it is larger than the sum of its proper divisors (1).

31656929 is an equidigital number, since it uses as much as digits as its factorization.

31656929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 41.

The square root of 31656929 is about 5626.4490577984. The cubic root of 31656929 is about 316.3415663865.

The spelling of 31656929 in words is "thirty-one million, six hundred fifty-six thousand, nine hundred twenty-nine".