31897225 has 6 divisors (see below), whose sum is σ = 39552590. Its totient is φ = 25517760.

The previous prime is 31897207. The next prime is 31897231. The reversal of 31897225 is 52279813.

It can be written as a sum of positive squares in 3 ways, for example, as 447561 + 31449664 = 669^2 + 5608^2 .

It is not a de Polignac number, because 31897225 - 2⁷ = 31897097 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 637920 + ... + 637969.

Almost surely, 2^31897225 is an apocalyptic number.

It is an amenable number.

31897225 is a deficient number, since it is larger than the sum of its proper divisors (7655365).

31897225 is a wasteful number, since it uses less digits than its factorization.

31897225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275899 (or 1275894 counting only the distinct ones).

The product of its digits is 30240, while the sum is 37.

The square root of 31897225 is about 5647.7628314227. The cubic root of 31897225 is about 317.1399601557.

The spelling of 31897225 in words is "thirty-one million, eight hundred ninety-seven thousand, two hundred twenty-five".