31620125 has 16 divisors (see below), whose sum is σ = 39783744. Its totient is φ = 25090000.

The previous prime is 31620109. The next prime is 31620131. The reversal of 31620125 is 52102613.

It is not a de Polignac number, because 31620125 - 2⁴ = 31620109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31620097 and 31620106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15410 + ... + 17340.

It is an arithmetic number, because the mean of its divisors is an integer number (2486484).

Almost surely, 2^31620125 is an apocalyptic number.

It is an amenable number.

31620125 is a deficient number, since it is larger than the sum of its proper divisors (8163619).

31620125 is a wasteful number, since it uses less digits than its factorization.

31620125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2077 (or 2067 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 31620125 is about 5623.1774825271. The cubic root of 31620125 is about 316.2189270975.

Adding to 31620125 its reverse (52102613), we get a palindrome (83722738).

The spelling of 31620125 in words is "thirty-one million, six hundred twenty thousand, one hundred twenty-five".