12810557 has 2 divisors, whose sum is σ = 12810558. Its totient is φ = 12810556.

The previous prime is 12810529. The next prime is 12810559. The reversal of 12810557 is 75501821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8726116 + 4084441 = 2954^2 + 2021^2 .

It is a cyclic number.

It is not a de Polignac number, because 12810557 - 2¹⁶ = 12745021 is a prime.

It is a super-2 number, since 2×12810557² = 328220741300498, which contains 22 as substring.

Together with 12810559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12810559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6405278 + 6405279.

It is an arithmetic number, because the mean of its divisors is an integer number (6405279).

Almost surely, 2^12810557 is an apocalyptic number.

It is an amenable number.

12810557 is a deficient number, since it is larger than the sum of its proper divisors (1).

12810557 is an equidigital number, since it uses as much as digits as its factorization.

12810557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 12810557 is about 3579.1838455156. The cubic root of 12810557 is about 233.9857115000.

The spelling of 12810557 in words is "twelve million, eight hundred ten thousand, five hundred fifty-seven".