31321120 has 48 divisors (see below), whose sum is σ = 77898240. Its totient is φ = 11867904.

The previous prime is 31321109. The next prime is 31321127. The reversal of 31321120 is 2112313.

It is a self number, because there is not a number n which added to its sum of digits gives 31321120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321127) 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 7 ways as a sum of consecutive naturals, for example, 2112 + ... + 8191.

It is an arithmetic number, because the mean of its divisors is an integer number (1622880).

Almost surely, 2^31321120 is an apocalyptic number.

It is an amenable number.

31321120 is an abundant number, since it is smaller than the sum of its proper divisors (46577120).

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

31321120 is a wasteful number, since it uses less digits than its factorization.

31321120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10337 (or 10329 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 31321120 is about 5596.5274947953. The cubic root of 31321120 is about 315.2190296601.

Adding to 31321120 its reverse (2112313), we get a palindrome (33433433).

The spelling of 31321120 in words is "thirty-one million, three hundred twenty-one thousand, one hundred twenty".