31297225 has 12 divisors (see below), whose sum is σ = 39278736. Its totient is φ = 24734480.

The previous prime is 31297219. The next prime is 31297247. The reversal of 31297225 is 52279213.

It is not a de Polignac number, because 31297225 - 2¹³ = 31289033 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5467 + ... + 9616.

It is an arithmetic number, because the mean of its divisors is an integer number (3273228).

Almost surely, 2^31297225 is an apocalyptic number.

It is an amenable number.

31297225 is a deficient number, since it is larger than the sum of its proper divisors (7981511).

31297225 is a wasteful number, since it uses less digits than its factorization.

31297225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15176 (or 15171 counting only the distinct ones).

The product of its digits is 7560, while the sum is 31.

The square root of 31297225 is about 5594.3922815620. The cubic root of 31297225 is about 315.1388486729.

The spelling of 31297225 in words is "thirty-one million, two hundred ninety-seven thousand, two hundred twenty-five".