31200012987 has 24 divisors (see below), whose sum is σ = 49243003152. Its totient is φ = 17454550080.

The previous prime is 31200012953. The next prime is 31200012989. The reversal of 31200012987 is 78921000213.

It is not a de Polignac number, because 31200012987 - 2⁷ = 31200012859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (31200012989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3301068 + ... + 3310505.

It is an arithmetic number, because the mean of its divisors is an integer number (2051791798).

Almost surely, 2^31200012987 is an apocalyptic number.

31200012987 is a deficient number, since it is larger than the sum of its proper divisors (18042990165).

31200012987 is a wasteful number, since it uses less digits than its factorization.

31200012987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6611611 (or 6611600 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The spelling of 31200012987 in words is "thirty-one billion, two hundred million, twelve thousand, nine hundred eighty-seven".