12515515291 has 2 divisors, whose sum is σ = 12515515292. Its totient is φ = 12515515290.

The previous prime is 12515515283. The next prime is 12515515321. The reversal of 12515515291 is 19251551521.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12515515291 - 2³ = 12515515283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12515515291.

It is not a weakly prime, because it can be changed into another prime (12515515211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6257757645 + 6257757646.

It is an arithmetic number, because the mean of its divisors is an integer number (6257757646).

Almost surely, 2^12515515291 is an apocalyptic number.

12515515291 is a deficient number, since it is larger than the sum of its proper divisors (1).

12515515291 is an equidigital number, since it uses as much as digits as its factorization.

12515515291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22500, while the sum is 37.

The spelling of 12515515291 in words is "twelve billion, five hundred fifteen million, five hundred fifteen thousand, two hundred ninety-one".