31540115120 has 20 divisors (see below), whose sum is σ = 73330767840. Its totient is φ = 12616046016.

The previous prime is 31540115111. The next prime is 31540115149. The reversal of 31540115120 is 2151104513.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×31540115120² (a number of 22 digits) contains 22 as substring.

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, 197125640 + ... + 197125799.

It is an arithmetic number, because the mean of its divisors is an integer number (3666538392).

Almost surely, 2^31540115120 is an apocalyptic number.

It is an amenable number.

31540115120 is an abundant number, since it is smaller than the sum of its proper divisors (41790652720).

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

31540115120 is a wasteful number, since it uses less digits than its factorization.

31540115120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394251452 (or 394251446 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 31540115120 its reverse (2151104513), we get a palindrome (33691219633).

The spelling of 31540115120 in words is "thirty-one billion, five hundred forty million, one hundred fifteen thousand, one hundred twenty".