31587442723 has 6 divisors (see below), whose sum is σ = 32060373644. Its totient is φ = 31114555296.

The previous prime is 31587442697. The next prime is 31587442729. The reversal of 31587442723 is 32724478513.

It is a de Polignac number, because none of the positive numbers 2^k-31587442723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31587442729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1443915 + ... + 1465627.

Almost surely, 2^31587442723 is an apocalyptic number.

31587442723 is a deficient number, since it is larger than the sum of its proper divisors (472930921).

31587442723 is an frugal number, since it uses more digits than its factorization.

31587442723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43493 (or 21780 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 46.

The spelling of 31587442723 in words is "thirty-one billion, five hundred eighty-seven million, four hundred forty-two thousand, seven hundred twenty-three".