31696591 has 2 divisors, whose sum is σ = 31696592. Its totient is φ = 31696590.

The previous prime is 31696589. The next prime is 31696603. The reversal of 31696591 is 19569613.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31696591 - 2¹ = 31696589 is a prime.

Together with 31696589, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31696991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15848295 + 15848296.

It is an arithmetic number, because the mean of its divisors is an integer number (15848296).

Almost surely, 2^31696591 is an apocalyptic number.

31696591 is a deficient number, since it is larger than the sum of its proper divisors (1).

31696591 is an equidigital number, since it uses as much as digits as its factorization.

31696591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43740, while the sum is 40.

The square root of 31696591 is about 5629.9725576596. The cubic root of 31696591 is about 316.4736228160.

The spelling of 31696591 in words is "thirty-one million, six hundred ninety-six thousand, five hundred ninety-one".