12818557 has 2 divisors, whose sum is σ = 12818558. Its totient is φ = 12818556.

The previous prime is 12818543. The next prime is 12818563. The reversal of 12818557 is 75581821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11215801 + 1602756 = 3349^2 + 1266^2 .

It is a cyclic number.

It is not a de Polignac number, because 12818557 - 2¹⁵ = 12785789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12810557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6409278 + 6409279.

It is an arithmetic number, because the mean of its divisors is an integer number (6409279).

Almost surely, 2^12818557 is an apocalyptic number.

It is an amenable number.

12818557 is a deficient number, since it is larger than the sum of its proper divisors (1).

12818557 is an equidigital number, since it uses as much as digits as its factorization.

12818557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22400, while the sum is 37.

The square root of 12818557 is about 3580.3012443089. The cubic root of 12818557 is about 234.0344082161.

The spelling of 12818557 in words is "twelve million, eight hundred eighteen thousand, five hundred fifty-seven".