31707693 has 10 divisors (see below), whose sum is σ = 47365934. Its totient is φ = 21138408.

The previous prime is 31707679. The next prime is 31707749. The reversal of 31707693 is 39670713.

It can be written as a sum of positive squares in only one way, i.e., 25220484 + 6487209 = 5022^2 + 2547^2 .

It is not a de Polignac number, because 31707693 - 2⁵ = 31707661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31707673) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 195646 + ... + 195807.

Almost surely, 2^31707693 is an apocalyptic number.

It is an amenable number.

31707693 is a deficient number, since it is larger than the sum of its proper divisors (15658241).

31707693 is an equidigital number, since it uses as much as digits as its factorization.

31707693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391465 (or 391456 counting only the distinct ones).

The product of its (nonzero) digits is 23814, while the sum is 36.

The square root of 31707693 is about 5630.9584441727. The cubic root of 31707693 is about 316.5105676937.

It can be divided in two parts, 31707 and 693, that added together give a square (32400 = 180²).

The spelling of 31707693 in words is "thirty-one million, seven hundred seven thousand, six hundred ninety-three".