31581364465 has 16 divisors (see below), whose sum is σ = 43360457472. Its totient is φ = 21631356864.

The previous prime is 31581364427. The next prime is 31581364471. The reversal of 31581364465 is 56446318513.

It is a cyclic number.

It is not a de Polignac number, because 31581364465 - 2¹⁵ = 31581331697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 477594 + ... + 539683.

It is an arithmetic number, because the mean of its divisors is an integer number (2710028592).

Almost surely, 2^31581364465 is an apocalyptic number.

31581364465 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31581364465 is a deficient number, since it is larger than the sum of its proper divisors (11779093007).

31581364465 is a wasteful number, since it uses less digits than its factorization.

31581364465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018176.

The product of its digits is 1036800, while the sum is 46.

The spelling of 31581364465 in words is "thirty-one billion, five hundred eighty-one million, three hundred sixty-four thousand, four hundred sixty-five".