31693631 has 2 divisors, whose sum is σ = 31693632. Its totient is φ = 31693630.

The previous prime is 31693621. The next prime is 31693637. The reversal of 31693631 is 13639613.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31693631 - 2⁶ = 31693567 is a prime.

It is a super-2 number, since 2×31693631² = 2008972491928322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31693637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15846815 + 15846816.

It is an arithmetic number, because the mean of its divisors is an integer number (15846816).

Almost surely, 2^31693631 is an apocalyptic number.

31693631 is a deficient number, since it is larger than the sum of its proper divisors (1).

31693631 is an equidigital number, since it uses as much as digits as its factorization.

31693631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8748, while the sum is 32.

The square root of 31693631 is about 5629.7096727984. The cubic root of 31693631 is about 316.4637711668.

The spelling of 31693631 in words is "thirty-one million, six hundred ninety-three thousand, six hundred thirty-one".