31690859 has 2 divisors, whose sum is σ = 31690860. Its totient is φ = 31690858.

The previous prime is 31690801. The next prime is 31690861. The reversal of 31690859 is 95809613.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31690859 - 2²⁴ = 14913643 is a prime.

Together with 31690861, 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 (31690889) 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, 15845429 + 15845430.

It is an arithmetic number, because the mean of its divisors is an integer number (15845430).

Almost surely, 2^31690859 is an apocalyptic number.

31690859 is a deficient number, since it is larger than the sum of its proper divisors (1).

31690859 is an equidigital number, since it uses as much as digits as its factorization.

31690859 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 31690859 is about 5629.4634735470. The cubic root of 31690859 is about 316.4545446743.

The spelling of 31690859 in words is "thirty-one million, six hundred ninety thousand, eight hundred fifty-nine".