12969961391 has 4 divisors (see below), whose sum is σ = 12970196784. Its totient is φ = 12969726000.

The previous prime is 12969961343. The next prime is 12969961397. The reversal of 12969961391 is 19316996921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19316996921 = 1487 ⋅12990583.

It is a cyclic number.

It is not a de Polignac number, because 12969961391 - 2¹⁸ = 12969699247 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 (12969961397) 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, 14291 + ... + 161691.

It is an arithmetic number, because the mean of its divisors is an integer number (3242549196).

Almost surely, 2^12969961391 is an apocalyptic number.

12969961391 is a deficient number, since it is larger than the sum of its proper divisors (235393).

12969961391 is an equidigital number, since it uses as much as digits as its factorization.

12969961391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235392.

The product of its digits is 1417176, while the sum is 56.

The spelling of 12969961391 in words is "twelve billion, nine hundred sixty-nine million, nine hundred sixty-one thousand, three hundred ninety-one".