31970971 has 4 divisors (see below), whose sum is σ = 31982944. Its totient is φ = 31959000.

The previous prime is 31970969. The next prime is 31970987. The reversal of 31970971 is 17907913.

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 is a cyclic number.

It is not a de Polignac number, because 31970971 - 2¹ = 31970969 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 31970971.

It is not an unprimeable number, because it can be changed into a prime (31970921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46 + ... + 7996.

It is an arithmetic number, because the mean of its divisors is an integer number (7995736).

Almost surely, 2^31970971 is an apocalyptic number.

31970971 is a deficient number, since it is larger than the sum of its proper divisors (11973).

31970971 is an equidigital number, since it uses as much as digits as its factorization.

31970971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11972.

The product of its (nonzero) digits is 11907, while the sum is 37.

The square root of 31970971 is about 5654.2878419833. The cubic root of 31970971 is about 317.3841799639.

The spelling of 31970971 in words is "thirty-one million, nine hundred seventy thousand, nine hundred seventy-one".