12956393091 has 16 divisors (see below), whose sum is σ = 17640965376. Its totient is φ = 8455445856.

The previous prime is 12956393089. The next prime is 12956393123. The reversal of 12956393091 is 19039365921.

It is not a de Polignac number, because 12956393091 - 2¹ = 12956393089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12956393091.

It is not an unprimeable number, because it can be changed into a prime (12956393011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21535 + ... + 162408.

It is an arithmetic number, because the mean of its divisors is an integer number (1102560336).

Almost surely, 2^12956393091 is an apocalyptic number.

12956393091 is a deficient number, since it is larger than the sum of its proper divisors (4684572285).

12956393091 is a wasteful number, since it uses less digits than its factorization.

12956393091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184442.

The product of its (nonzero) digits is 393660, while the sum is 48.

The spelling of 12956393091 in words is "twelve billion, nine hundred fifty-six million, three hundred ninety-three thousand, ninety-one".