31288972442 has 40 divisors (see below), whose sum is σ = 58964287956. Its totient is φ = 12378030336.

The previous prime is 31288972433. The next prime is 31288972457. The reversal of 31288972442 is 24427988213.

It can be written as a sum of positive squares in 2 ways, for example, as 29261181481 + 2027790961 = 171059^2 + 45031^2 .

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 188183 + ... + 313034.

Almost surely, 2^31288972442 is an apocalyptic number.

31288972442 is a deficient number, since it is larger than the sum of its proper divisors (27675315514).

31288972442 is an equidigital number, since it uses as much as digits as its factorization.

31288972442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501260 (or 501239 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 50.

The spelling of 31288972442 in words is "thirty-one billion, two hundred eighty-eight million, nine hundred seventy-two thousand, four hundred forty-two".