31969161 has 20 divisors (see below), whose sum is σ = 54579712. Its totient is φ = 18267768.

The previous prime is 31969159. The next prime is 31969177. The reversal of 31969161 is 16196913.

It is not a de Polignac number, because 31969161 - 2¹ = 31969159 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31969121) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 27625 + ... + 28758.

Almost surely, 2^31969161 is an apocalyptic number.

It is an amenable number.

31969161 is a deficient number, since it is larger than the sum of its proper divisors (22610551).

31969161 is an equidigital number, since it uses as much as digits as its factorization.

31969161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56402 (or 56393 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 31969161 is about 5654.1277841945. The cubic root of 31969161 is about 317.3781904033.

The spelling of 31969161 in words is "thirty-one million, nine hundred sixty-nine thousand, one hundred sixty-one".