12931556089 has 3 divisors (see below), whose sum is σ = 12931669807. Its totient is φ = 12931442372.

The previous prime is 12931556051. The next prime is 12931556117. The reversal of 12931556089 is 98065513921.

The square root of 12931556089 is 113717.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 10560645225 + 2370910864 = 102765^2 + 48692^2 .

It is not a de Polignac number, because 12931556089 - 2⁹ = 12931555577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12931556189) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 56859 + ... + 170575.

Almost surely, 2^12931556089 is an apocalyptic number.

12931556089 is the 113717-th square number.

12931556089 is the 56859-th centered octagonal number.

It is an amenable number.

12931556089 is a deficient number, since it is larger than the sum of its proper divisors (113718).

12931556089 is an frugal number, since it uses more digits than its factorization.

12931556089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227434 (or 113717 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 49.

Multiplying 12931556089 by its sum of digits (49), we get a square (633646248361 = 796019²).

The spelling of 12931556089 in words is "twelve billion, nine hundred thirty-one million, five hundred fifty-six thousand, eighty-nine".