31000123112 has 32 divisors (see below), whose sum is σ = 67086558720. Its totient is φ = 13154222400.

The previous prime is 31000123103. The next prime is 31000123157. The reversal of 31000123112 is 21132100013.

It is a super-2 number, since 2×31000123112² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2734808 + ... + 2746119.

It is an arithmetic number, because the mean of its divisors is an integer number (2096454960).

Almost surely, 2^31000123112 is an apocalyptic number.

It is an amenable number.

31000123112 is an abundant number, since it is smaller than the sum of its proper divisors (36086435608).

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

31000123112 is a wasteful number, since it uses less digits than its factorization.

31000123112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5481041 (or 5481037 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 31000123112 its reverse (21132100013), we get a palindrome (52132223125).

The spelling of 31000123112 in words is "thirty-one billion, one hundred twenty-three thousand, one hundred twelve".