31587177413 has 12 divisors (see below), whose sum is σ = 34778418444. Its totient is φ = 28667126400.

The previous prime is 31587177383. The next prime is 31587177421. The reversal of 31587177413 is 31477178513.

It can be written as a sum of positive squares in 2 ways, for example, as 17255975044 + 14331202369 = 131362^2 + 119713^2 .

It is not a de Polignac number, because 31587177413 - 2²⁰ = 31586128837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31587177313) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 148358 + ... + 291863.

It is an arithmetic number, because the mean of its divisors is an integer number (2898201537).

Almost surely, 2^31587177413 is an apocalyptic number.

It is an amenable number.

31587177413 is a deficient number, since it is larger than the sum of its proper divisors (3191241031).

31587177413 is a wasteful number, since it uses less digits than its factorization.

31587177413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440836 (or 440825 counting only the distinct ones).

The product of its digits is 493920, while the sum is 47.

The spelling of 31587177413 in words is "thirty-one billion, five hundred eighty-seven million, one hundred seventy-seven thousand, four hundred thirteen".