12931641577 has 4 divisors (see below), whose sum is σ = 12973764496. Its totient is φ = 12889518660.

The previous prime is 12931641571. The next prime is 12931641581. The reversal of 12931641577 is 77514613921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12931641577 is a prime.

It is a super-3 number, since 3×12931641577³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12931641571) 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, 21060999 + ... + 21061612.

It is an arithmetic number, because the mean of its divisors is an integer number (3243441124).

Almost surely, 2^12931641577 is an apocalyptic number.

It is an amenable number.

12931641577 is a deficient number, since it is larger than the sum of its proper divisors (42122919).

12931641577 is an equidigital number, since it uses as much as digits as its factorization.

12931641577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42122918.

The product of its digits is 317520, while the sum is 46.

The spelling of 12931641577 in words is "twelve billion, nine hundred thirty-one million, six hundred forty-one thousand, five hundred seventy-seven".