31996957 has 2 divisors, whose sum is σ = 31996958. Its totient is φ = 31996956.

The previous prime is 31996871. The next prime is 31996961. The reversal of 31996957 is 75969913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31967716 + 29241 = 5654^2 + 171^2 .

It is a cyclic number.

It is not a de Polignac number, because 31996957 - 2¹⁹ = 31472669 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31996957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31996457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15998478 + 15998479.

It is an arithmetic number, because the mean of its divisors is an integer number (15998479).

Almost surely, 2^31996957 is an apocalyptic number.

It is an amenable number.

31996957 is a deficient number, since it is larger than the sum of its proper divisors (1).

31996957 is an equidigital number, since it uses as much as digits as its factorization.

31996957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 459270, while the sum is 49.

The square root of 31996957 is about 5656.5852773559. The cubic root of 31996957 is about 317.4701466134.

The spelling of 31996957 in words is "thirty-one million, nine hundred ninety-six thousand, nine hundred fifty-seven".