12939215437 has 2 divisors, whose sum is σ = 12939215438. Its totient is φ = 12939215436.

The previous prime is 12939215411. The next prime is 12939215467. The reversal of 12939215437 is 73451293921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10590262281 + 2348953156 = 102909^2 + 48466^2 .

It is an emirp because it is prime and its reverse (73451293921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12939215437 is a prime.

It is a super-2 number, since 2×12939215437² (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 (12939215407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6469607718 + 6469607719.

It is an arithmetic number, because the mean of its divisors is an integer number (6469607719).

Almost surely, 2^12939215437 is an apocalyptic number.

It is an amenable number.

12939215437 is a deficient number, since it is larger than the sum of its proper divisors (1).

12939215437 is an equidigital number, since it uses as much as digits as its factorization.

12939215437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 46.

The spelling of 12939215437 in words is "twelve billion, nine hundred thirty-nine million, two hundred fifteen thousand, four hundred thirty-seven".