15831091057 has 4 divisors (see below), whose sum is σ = 15834393316. Its totient is φ = 15827788800.

The previous prime is 15831091051. The next prime is 15831091069. The reversal of 15831091057 is 75019013851.

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 10881827856 + 4949263201 = 104316^2 + 70351^2 .

It is a cyclic number.

It is not a de Polignac number, because 15831091057 - 2³ = 15831091049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15831091051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1643928 + ... + 1653529.

It is an arithmetic number, because the mean of its divisors is an integer number (3958598329).

Almost surely, 2^15831091057 is an apocalyptic number.

It is an amenable number.

15831091057 is a deficient number, since it is larger than the sum of its proper divisors (3302259).

15831091057 is an equidigital number, since it uses as much as digits as its factorization.

15831091057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3302258.

The product of its (nonzero) digits is 37800, while the sum is 40.

The spelling of 15831091057 in words is "fifteen billion, eight hundred thirty-one million, ninety-one thousand, fifty-seven".