31597145 has 4 divisors (see below), whose sum is σ = 37916580. Its totient is φ = 25277712.

The previous prime is 31597129. The next prime is 31597151. The reversal of 31597145 is 54179513.

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 17073424 + 14523721 = 4132^2 + 3811^2 .

It is a cyclic number.

It is not a de Polignac number, because 31597145 - 2⁴ = 31597129 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3159710 + ... + 3159719.

It is an arithmetic number, because the mean of its divisors is an integer number (9479145).

Almost surely, 2^31597145 is an apocalyptic number.

It is an amenable number.

31597145 is a deficient number, since it is larger than the sum of its proper divisors (6319435).

31597145 is an equidigital number, since it uses as much as digits as its factorization.

31597145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6319434.

The product of its digits is 18900, while the sum is 35.

The square root of 31597145 is about 5621.1337824322. The cubic root of 31597145 is about 316.1423042503.

The spelling of 31597145 in words is "thirty-one million, five hundred ninety-seven thousand, one hundred forty-five".