31670520971 has 4 divisors (see below), whose sum is σ = 32442972744. Its totient is φ = 30898069200.

The previous prime is 31670520919. The next prime is 31670520977. The reversal of 31670520971 is 17902507613.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31670520971 - 2²⁶ = 31603412107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 772451731 = 31670520971 / (3 + 1 + 6 + 7 + 0 + 5 + 2 + 0 + 9 + 7 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31670520977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386225825 + ... + 386225906.

It is an arithmetic number, because the mean of its divisors is an integer number (8110743186).

Almost surely, 2^31670520971 is an apocalyptic number.

31670520971 is a deficient number, since it is larger than the sum of its proper divisors (772451773).

31670520971 is an equidigital number, since it uses as much as digits as its factorization.

31670520971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772451772.

The product of its (nonzero) digits is 79380, while the sum is 41.

The spelling of 31670520971 in words is "thirty-one billion, six hundred seventy million, five hundred twenty thousand, nine hundred seventy-one".