31000120 has 32 divisors (see below), whose sum is σ = 70099920. Its totient is φ = 12337920.

The previous prime is 31000087. The next prime is 31000127. The reversal of 31000120 is 2100013.

It is a super-2 number, since 2×31000120² = 1922014880028800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31000127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6604 + ... + 10276.

Almost surely, 2^31000120 is an apocalyptic number.

It is an amenable number.

31000120 is an abundant number, since it is smaller than the sum of its proper divisors (39099800).

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

31000120 is a wasteful number, since it uses less digits than its factorization.

31000120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3895 (or 3891 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 7.

The square root of 31000120 is about 5567.7751391377. The cubic root of 31000120 is about 314.1384705781.

Adding to 31000120 its reverse (2100013), we get a palindrome (33100133).

The spelling of 31000120 in words is "thirty-one million, one hundred twenty", and thus it is an aban number.