31331693 has 2 divisors, whose sum is σ = 31331694. Its totient is φ = 31331692.

The previous prime is 31331683. The next prime is 31331701. The reversal of 31331693 is 39613313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19518724 + 11812969 = 4418^2 + 3437^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31331693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31331603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15665846 + 15665847.

It is an arithmetic number, because the mean of its divisors is an integer number (15665847).

Almost surely, 2^31331693 is an apocalyptic number.

It is an amenable number.

31331693 is a deficient number, since it is larger than the sum of its proper divisors (1).

31331693 is an equidigital number, since it uses as much as digits as its factorization.

31331693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4374, while the sum is 29.

The square root of 31331693 is about 5597.4720186884. The cubic root of 31331693 is about 315.2544949293.

The spelling of 31331693 in words is "thirty-one million, three hundred thirty-one thousand, six hundred ninety-three".