12631279 has 2 divisors, whose sum is σ = 12631280. Its totient is φ = 12631278.

The previous prime is 12631277. The next prime is 12631303. The reversal of 12631279 is 97213621.

It is a weak prime.

It is an emirp because it is prime and its reverse (97213621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12631279 - 2¹ = 12631277 is a prime.

Together with 12631277, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 12631279.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12631273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6315639 + 6315640.

It is an arithmetic number, because the mean of its divisors is an integer number (6315640).

Almost surely, 2^12631279 is an apocalyptic number.

12631279 is a deficient number, since it is larger than the sum of its proper divisors (1).

12631279 is an equidigital number, since it uses as much as digits as its factorization.

12631279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 31.

The square root of 12631279 is about 3554.0510688509. The cubic root of 12631279 is about 232.8890714514.

The spelling of 12631279 in words is "twelve million, six hundred thirty-one thousand, two hundred seventy-nine".