31121120 has 24 divisors (see below), whose sum is σ = 73524024. Its totient is φ = 12448384.

The previous prime is 31121087. The next prime is 31121137. The reversal of 31121120 is 2112113.

It is a super-2 number, since 2×31121120² = 1937048220108800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97094 + ... + 97413.

It is an arithmetic number, because the mean of its divisors is an integer number (3063501).

Almost surely, 2^31121120 is an apocalyptic number.

It is an amenable number.

31121120 is an abundant number, since it is smaller than the sum of its proper divisors (42402904).

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

31121120 is a wasteful number, since it uses less digits than its factorization.

31121120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194522 (or 194514 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 31121120 is about 5578.6306563529. The cubic root of 31121120 is about 314.5466561726.

Adding to 31121120 its reverse (2112113), we get a palindrome (33233233).

The spelling of 31121120 in words is "thirty-one million, one hundred twenty-one thousand, one hundred twenty".