31694893 has 2 divisors, whose sum is σ = 31694894. Its totient is φ = 31694892.

The previous prime is 31694891. The next prime is 31694909. The reversal of 31694893 is 39849613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23843689 + 7851204 = 4883^2 + 2802^2 .

It is a cyclic number.

It is not a de Polignac number, because 31694893 - 2¹ = 31694891 is a prime.

Together with 31694891, 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 (31694891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15847446 + 15847447.

It is an arithmetic number, because the mean of its divisors is an integer number (15847447).

Almost surely, 2^31694893 is an apocalyptic number.

It is an amenable number.

31694893 is a deficient number, since it is larger than the sum of its proper divisors (1).

31694893 is an equidigital number, since it uses as much as digits as its factorization.

31694893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 43.

The square root of 31694893 is about 5629.8217556154. The cubic root of 31694893 is about 316.4679715058.

The spelling of 31694893 in words is "thirty-one million, six hundred ninety-four thousand, eight hundred ninety-three".