31697663 has 2 divisors, whose sum is σ = 31697664. Its totient is φ = 31697662.

The previous prime is 31697651. The next prime is 31697669. The reversal of 31697663 is 36679613.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31697663 - 2⁴ = 31697647 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31697663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31697669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15848831 + 15848832.

It is an arithmetic number, because the mean of its divisors is an integer number (15848832).

Almost surely, 2^31697663 is an apocalyptic number.

31697663 is a deficient number, since it is larger than the sum of its proper divisors (1).

31697663 is an equidigital number, since it uses as much as digits as its factorization.

31697663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 41.

The square root of 31697663 is about 5630.0677615816. The cubic root of 31697663 is about 316.4771905593.

It can be divided in two parts, 316 and 97663, that added together give a palindrome (97979).

The spelling of 31697663 in words is "thirty-one million, six hundred ninety-seven thousand, six hundred sixty-three".