31387325 has 12 divisors (see below), whose sum is σ = 39470688. Its totient is φ = 24754800.

The previous prime is 31387319. The next prime is 31387331. The reversal of 31387325 is 52378313.

It is an interprime number because it is at equal distance from previous prime (31387319) and next prime (31387331).

It is not a de Polignac number, because 31387325 - 2⁶ = 31387261 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31387291 and 31387300.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7067 + ... + 10616.

It is an arithmetic number, because the mean of its divisors is an integer number (3289224).

Almost surely, 2^31387325 is an apocalyptic number.

It is an amenable number.

31387325 is a deficient number, since it is larger than the sum of its proper divisors (8083363).

31387325 is a wasteful number, since it uses less digits than its factorization.

31387325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17764 (or 17759 counting only the distinct ones).

The product of its digits is 15120, while the sum is 32.

The square root of 31387325 is about 5602.4392009195. The cubic root of 31387325 is about 315.4409713734.

The spelling of 31387325 in words is "thirty-one million, three hundred eighty-seven thousand, three hundred twenty-five".