31120425 has 36 divisors (see below), whose sum is σ = 63706240. Its totient is φ = 14225760.

The previous prime is 31120417. The next prime is 31120447. The reversal of 31120425 is 52402113.

It is not a de Polignac number, because 31120425 - 2³ = 31120417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31120398 and 31120407.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8305 + ... + 11454.

Almost surely, 2^31120425 is an apocalyptic number.

31120425 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31120425 is an abundant number, since it is smaller than the sum of its proper divisors (32585815).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31120425 is a wasteful number, since it uses less digits than its factorization.

31120425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19782 (or 19774 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 31120425 is about 5578.5683647330. The cubic root of 31120425 is about 314.5443146593.

Adding to 31120425 its reverse (52402113), we get a palindrome (83522538).

It can be divided in two parts, 311 and 20425, that added together give a 4-th power (20736 = 12⁴).

The spelling of 31120425 in words is "thirty-one million, one hundred twenty thousand, four hundred twenty-five".