31478984465 has 4 divisors (see below), whose sum is σ = 37774781364. Its totient is φ = 25183187568.

The previous prime is 31478984429. The next prime is 31478984489. The reversal of 31478984465 is 56448987413.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11742106321 + 19736878144 = 108361^2 + 140488^2 .

It is a cyclic number.

It is not a de Polignac number, because 31478984465 - 2¹⁰ = 31478983441 is a prime.

It is a super-2 number, since 2×31478984465² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3147898442 + ... + 3147898451.

It is an arithmetic number, because the mean of its divisors is an integer number (9443695341).

Almost surely, 2^31478984465 is an apocalyptic number.

It is an amenable number.

31478984465 is a deficient number, since it is larger than the sum of its proper divisors (6295796899).

31478984465 is an equidigital number, since it uses as much as digits as its factorization.

31478984465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6295796898.

The product of its digits is 23224320, while the sum is 59.

The spelling of 31478984465 in words is "thirty-one billion, four hundred seventy-eight million, nine hundred eighty-four thousand, four hundred sixty-five".