31961345 has 32 divisors (see below), whose sum is σ = 43182720. Its totient is φ = 22556160.

The previous prime is 31961339. The next prime is 31961351. The reversal of 31961345 is 54316913.

It is an interprime number because it is at equal distance from previous prime (31961339) and next prime (31961351).

It is not a de Polignac number, because 31961345 - 2¹⁰ = 31960321 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 178466 + ... + 178644.

It is an arithmetic number, because the mean of its divisors is an integer number (1349460).

Almost surely, 2^31961345 is an apocalyptic number.

It is an amenable number.

31961345 is a deficient number, since it is larger than the sum of its proper divisors (11221375).

31961345 is a wasteful number, since it uses less digits than its factorization.

31961345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305.

The product of its digits is 9720, while the sum is 32.

The square root of 31961345 is about 5653.4365654883. The cubic root of 31961345 is about 317.3523234944.

The spelling of 31961345 in words is "thirty-one million, nine hundred sixty-one thousand, three hundred forty-five".