31290325 has 12 divisors (see below), whose sum is σ = 42327648. Its totient is φ = 22756400.

The previous prime is 31290323. The next prime is 31290341. The reversal of 31290325 is 52309213.

It is a happy number.

It is not a de Polignac number, because 31290325 - 2¹ = 31290323 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 31290325.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31290323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56617 + ... + 57166.

It is an arithmetic number, because the mean of its divisors is an integer number (3527304).

Almost surely, 2^31290325 is an apocalyptic number.

It is an amenable number.

31290325 is a deficient number, since it is larger than the sum of its proper divisors (11037323).

31290325 is a wasteful number, since it uses less digits than its factorization.

31290325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113804 (or 113799 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 31290325 is about 5593.7755586008. The cubic root of 31290325 is about 315.1156877497.

Adding to 31290325 its reverse (52309213), we get a palindrome (83599538).

The spelling of 31290325 in words is "thirty-one million, two hundred ninety thousand, three hundred twenty-five".