31545745 has 16 divisors (see below), whose sum is σ = 47196288. Its totient is φ = 19664640.

The previous prime is 31545743. The next prime is 31545749. The reversal of 31545745 is 54754513.

It is not a de Polignac number, because 31545745 - 2¹ = 31545743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31545745.

It is not an unprimeable number, because it can be changed into a prime (31545743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40584 + ... + 41353.

It is an arithmetic number, because the mean of its divisors is an integer number (2949768).

Almost surely, 2^31545745 is an apocalyptic number.

31545745 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31545745 is a deficient number, since it is larger than the sum of its proper divisors (15650543).

31545745 is a wasteful number, since it uses less digits than its factorization.

31545745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81960.

The product of its digits is 42000, while the sum is 34.

The square root of 31545745 is about 5616.5598901819. The cubic root of 31545745 is about 315.9707852338.

The spelling of 31545745 in words is "thirty-one million, five hundred forty-five thousand, seven hundred forty-five".