31956997 has 4 divisors (see below), whose sum is σ = 31968460. Its totient is φ = 31945536.

The previous prime is 31956983. The next prime is 31957019. The reversal of 31956997 is 79965913.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1640961 + 30316036 = 1281^2 + 5506^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31956997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31956997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31956797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1453 + ... + 8125.

It is an arithmetic number, because the mean of its divisors is an integer number (7992115).

Almost surely, 2^31956997 is an apocalyptic number.

It is an amenable number.

31956997 is a deficient number, since it is larger than the sum of its proper divisors (11463).

31956997 is an equidigital number, since it uses as much as digits as its factorization.

31956997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11462.

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

The square root of 31956997 is about 5653.0520075442. The cubic root of 31956997 is about 317.3379320425.

The spelling of 31956997 in words is "thirty-one million, nine hundred fifty-six thousand, nine hundred ninety-seven".