31516686988 has 12 divisors (see below), whose sum is σ = 58398567192. Its totient is φ = 14831382080.

The previous prime is 31516686979. The next prime is 31516687001. The reversal of 31516686988 is 88968661513.

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, 231740278 + ... + 231740413.

It is an arithmetic number, because the mean of its divisors is an integer number (4866547266).

Almost surely, 2^31516686988 is an apocalyptic number.

It is an amenable number.

31516686988 is a deficient number, since it is larger than the sum of its proper divisors (26881880204).

31516686988 is a wasteful number, since it uses less digits than its factorization.

31516686988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463480712 (or 463480710 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 61.

The spelling of 31516686988 in words is "thirty-one billion, five hundred sixteen million, six hundred eighty-six thousand, nine hundred eighty-eight".