31640125 has 16 divisors (see below), whose sum is σ = 43078464. Its totient is φ = 23010000.

The previous prime is 31640039. The next prime is 31640129. The reversal of 31640125 is 52104613.

It is not a de Polignac number, because 31640125 - 2⁹ = 31639613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31640096 and 31640105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31640129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10131 + ... + 12880.

It is an arithmetic number, because the mean of its divisors is an integer number (2692404).

Almost surely, 2^31640125 is an apocalyptic number.

It is an amenable number.

31640125 is a deficient number, since it is larger than the sum of its proper divisors (11438339).

31640125 is a wasteful number, since it uses less digits than its factorization.

31640125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23037 (or 23027 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 31640125 is about 5624.9555553800. The cubic root of 31640125 is about 316.2855834395.

Adding to 31640125 its reverse (52104613), we get a palindrome (83744738).

The spelling of 31640125 in words is "thirty-one million, six hundred forty thousand, one hundred twenty-five".