12961893391 has 4 divisors (see below), whose sum is σ = 13312214872. Its totient is φ = 12611571912.

The previous prime is 12961893353. The next prime is 12961893419. The reversal of 12961893391 is 19339816921.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12961893391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12961893691) 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, 175160685 + ... + 175160758.

It is an arithmetic number, because the mean of its divisors is an integer number (3328053718).

Almost surely, 2^12961893391 is an apocalyptic number.

12961893391 is a deficient number, since it is larger than the sum of its proper divisors (350321481).

12961893391 is an equidigital number, since it uses as much as digits as its factorization.

12961893391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350321480.

The product of its digits is 629856, while the sum is 52.

The spelling of 12961893391 in words is "twelve billion, nine hundred sixty-one million, eight hundred ninety-three thousand, three hundred ninety-one".