31694891 has 2 divisors, whose sum is σ = 31694892. Its totient is φ = 31694890.

The previous prime is 31694849. The next prime is 31694893. The reversal of 31694891 is 19849613.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31694891 is a prime.

It is a super-2 number, since 2×31694891² = 2009132231003762, which contains 22 as substring.

Together with 31694893, 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 (31694893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15847445 + 15847446.

It is an arithmetic number, because the mean of its divisors is an integer number (15847446).

Almost surely, 2^31694891 is an apocalyptic number.

31694891 is a deficient number, since it is larger than the sum of its proper divisors (1).

31694891 is an equidigital number, since it uses as much as digits as its factorization.

31694891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 31694891 is about 5629.8215779898. The cubic root of 31694891 is about 316.4679648492.

The spelling of 31694891 in words is "thirty-one million, six hundred ninety-four thousand, eight hundred ninety-one".