31512136140 has 36 divisors (see below), whose sum is σ = 95586813504. Its totient is φ = 8403236256.

The previous prime is 31512136133. The next prime is 31512136193. The reversal of 31512136140 is 4163121513.

It is a happy number.

31512136140 is a `hidden beast` number, since 3 + 1 + 512 + 1 + 3 + 6 + 140 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87533532 + ... + 87533891.

It is an arithmetic number, because the mean of its divisors is an integer number (2655189264).

Almost surely, 2^31512136140 is an apocalyptic number.

31512136140 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31512136140 is an abundant number, since it is smaller than the sum of its proper divisors (64074677364).

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

31512136140 is a wasteful number, since it uses less digits than its factorization.

31512136140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175067438 (or 175067433 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

Adding to 31512136140 its reverse (4163121513), we get a palindrome (35675257653).

The spelling of 31512136140 in words is "thirty-one billion, five hundred twelve million, one hundred thirty-six thousand, one hundred forty".