12813557491 has 8 divisors (see below), whose sum is σ = 14645018880. Its totient is φ = 10982334408.

The previous prime is 12813557467. The next prime is 12813557503. The reversal of 12813557491 is 19475531821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12813557491 - 2⁷ = 12813557363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12813557291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76320 + ... + 177346.

It is an arithmetic number, because the mean of its divisors is an integer number (1830627360).

Almost surely, 2^12813557491 is an apocalyptic number.

12813557491 is a deficient number, since it is larger than the sum of its proper divisors (1831461389).

12813557491 is a wasteful number, since it uses less digits than its factorization.

12813557491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119153.

The product of its digits is 302400, while the sum is 46.

The spelling of 12813557491 in words is "twelve billion, eight hundred thirteen million, five hundred fifty-seven thousand, four hundred ninety-one".