12515539 has 2 divisors, whose sum is σ = 12515540. Its totient is φ = 12515538.

The previous prime is 12515527. The next prime is 12515543. The reversal of 12515539 is 93551521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12515539 - 2⁵ = 12515507 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12515539.

It is not a weakly prime, because it can be changed into another prime (12515549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6257769 + 6257770.

It is an arithmetic number, because the mean of its divisors is an integer number (6257770).

Almost surely, 2^12515539 is an apocalyptic number.

12515539 is a deficient number, since it is larger than the sum of its proper divisors (1).

12515539 is an equidigital number, since it uses as much as digits as its factorization.

12515539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6750, while the sum is 31.

The square root of 12515539 is about 3537.7307698580. The cubic root of 12515539 is about 232.1755693907.

The spelling of 12515539 in words is "twelve million, five hundred fifteen thousand, five hundred thirty-nine".