31345745 has 4 divisors (see below), whose sum is σ = 37614900. Its totient is φ = 25076592.

The previous prime is 31345703. The next prime is 31345789. The reversal of 31345745 is 54754313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6385729 + 24960016 = 2527^2 + 4996^2 .

It is a cyclic number.

It is not a de Polignac number, because 31345745 - 2¹² = 31341649 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 3134570 + ... + 3134579.

It is an arithmetic number, because the mean of its divisors is an integer number (9403725).

Almost surely, 2^31345745 is an apocalyptic number.

It is an amenable number.

31345745 is a deficient number, since it is larger than the sum of its proper divisors (6269155).

31345745 is an equidigital number, since it uses as much as digits as its factorization.

31345745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6269154.

The product of its digits is 25200, while the sum is 32.

The square root of 31345745 is about 5598.7270874727. The cubic root of 31345745 is about 315.3016175458.

The spelling of 31345745 in words is "thirty-one million, three hundred forty-five thousand, seven hundred forty-five".