31156729984 has 16 divisors (see below), whose sum is σ = 62070048270. Its totient is φ = 15578364928.

The previous prime is 31156729979. The next prime is 31156729997. The reversal of 31156729984 is 48992765113.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 26527288384 + 4629441600 = 162872^2 + 68040^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121705849 + ... + 121706104.

Almost surely, 2^31156729984 is an apocalyptic number.

It is an amenable number.

31156729984 is a deficient number, since it is larger than the sum of its proper divisors (30913318286).

31156729984 is an equidigital number, since it uses as much as digits as its factorization.

31156729984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243411967 (or 243411955 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 55.

It can be divided in two parts, 311567 and 29984, that added together give a triangular number (341551 = T₈₂₆).

The spelling of 31156729984 in words is "thirty-one billion, one hundred fifty-six million, seven hundred twenty-nine thousand, nine hundred eighty-four".