12964431581 has 2 divisors, whose sum is σ = 12964431582. Its totient is φ = 12964431580.

The previous prime is 12964431541. The next prime is 12964431617. The reversal of 12964431581 is 18513446921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12441394681 + 523036900 = 111541^2 + 22870^2 .

It is an emirp because it is prime and its reverse (18513446921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12964431581 - 2¹⁸ = 12964169437 is a prime.

It is a super-2 number, since 2×12964431581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12964431511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6482215790 + 6482215791.

It is an arithmetic number, because the mean of its divisors is an integer number (6482215791).

Almost surely, 2^12964431581 is an apocalyptic number.

It is an amenable number.

12964431581 is a deficient number, since it is larger than the sum of its proper divisors (1).

12964431581 is an equidigital number, since it uses as much as digits as its factorization.

12964431581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 44.

The spelling of 12964431581 in words is "twelve billion, nine hundred sixty-four million, four hundred thirty-one thousand, five hundred eighty-one".