31397265 has 48 divisors (see below), whose sum is σ = 57148416. Its totient is φ = 15926400.

The previous prime is 31397243. The next prime is 31397273. The reversal of 31397265 is 56279313.

31397265 is a `hidden beast` number, since 3 + 1 + 397 + 265 = 666.

It is not a de Polignac number, because 31397265 - 2⁹ = 31396753 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 98887 + ... + 99203.

It is an arithmetic number, because the mean of its divisors is an integer number (1190592).

Almost surely, 2^31397265 is an apocalyptic number.

It is an amenable number.

31397265 is a deficient number, since it is larger than the sum of its proper divisors (25751151).

31397265 is a wasteful number, since it uses less digits than its factorization.

31397265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430 (or 427 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 31397265 is about 5603.3262442945. The cubic root of 31397265 is about 315.4742666852.

It can be divided in two parts, 3139 and 7265, that added together give a square (10404 = 102²).

The spelling of 31397265 in words is "thirty-one million, three hundred ninety-seven thousand, two hundred sixty-five".