31545945 has 24 divisors (see below), whose sum is σ = 55501056. Its totient is φ = 16571808.

The previous prime is 31545923. The next prime is 31545953. The reversal of 31545945 is 54954513.

It is not a de Polignac number, because 31545945 - 2²⁴ = 14768729 is a prime.

It is a Curzon number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 2217 + ... + 8246.

It is an arithmetic number, because the mean of its divisors is an integer number (2312544).

Almost surely, 2^31545945 is an apocalyptic number.

It is an amenable number.

31545945 is a deficient number, since it is larger than the sum of its proper divisors (23955111).

31545945 is a wasteful number, since it uses less digits than its factorization.

31545945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10541 (or 10538 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 31545945 is about 5616.5776946464. The cubic root of 31545945 is about 315.9714529839.

The spelling of 31545945 in words is "thirty-one million, five hundred forty-five thousand, nine hundred forty-five".