31625121 has 32 divisors (see below), whose sum is σ = 48153600. Its totient is φ = 18290880.

The previous prime is 31625059. The next prime is 31625131. The reversal of 31625121 is 12152613.

It is not a de Polignac number, because 31625121 - 2⁶ = 31625057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31625131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71820 + ... + 72258.

It is an arithmetic number, because the mean of its divisors is an integer number (1504800).

Almost surely, 2^31625121 is an apocalyptic number.

It is an amenable number.

31625121 is a deficient number, since it is larger than the sum of its proper divisors (16528479).

31625121 is a wasteful number, since it uses less digits than its factorization.

31625121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549.

The product of its digits is 360, while the sum is 21.

The square root of 31625121 is about 5623.6216978029. The cubic root of 31625121 is about 316.2355804848.

Adding to 31625121 its reverse (12152613), we get a palindrome (43777734).

The spelling of 31625121 in words is "thirty-one million, six hundred twenty-five thousand, one hundred twenty-one".