31000113120 has 96 divisors (see below), whose sum is σ = 100032135840. Its totient is φ = 8065064960.

The previous prime is 31000113103. The next prime is 31000113143. The reversal of 31000113120 is 2131100013.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×31000113120² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 31000113096 and 31000113105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 767925 + ... + 807284.

It is an arithmetic number, because the mean of its divisors is an integer number (1042001415).

Almost surely, 2^31000113120 is an apocalyptic number.

31000113120 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31000113120 is an abundant number, since it is smaller than the sum of its proper divisors (69032022720).

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

31000113120 is a wasteful number, since it uses less digits than its factorization.

31000113120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1575268 (or 1575260 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

Adding to 31000113120 its reverse (2131100013), we get a palindrome (33131213133).

The spelling of 31000113120 in words is "thirty-one billion, one hundred thirteen thousand, one hundred twenty".