31910161 has 4 divisors (see below), whose sum is σ = 31960432. Its totient is φ = 31859892.

The previous prime is 31910143. The next prime is 31910167. The reversal of 31910161 is 16101913.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31910161 - 2¹⁷ = 31779089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31910167) 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 in 3 ways as a sum of consecutive naturals, for example, 24171 + ... + 25456.

It is an arithmetic number, because the mean of its divisors is an integer number (7990108).

Almost surely, 2^31910161 is an apocalyptic number.

It is an amenable number.

31910161 is a deficient number, since it is larger than the sum of its proper divisors (50271).

31910161 is an equidigital number, since it uses as much as digits as its factorization.

31910161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50270.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 31910161 is about 5648.9079475594. The cubic root of 31910161 is about 317.1828266648.

The spelling of 31910161 in words is "thirty-one million, nine hundred ten thousand, one hundred sixty-one".