12813557 has 2 divisors, whose sum is σ = 12813558. Its totient is φ = 12813556.

The previous prime is 12813523. The next prime is 12813569. The reversal of 12813557 is 75531821.

12813557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10699441 + 2114116 = 3271^2 + 1454^2 .

It is a cyclic number.

It is not a de Polignac number, because 12813557 - 2⁸ = 12813301 is a prime.

It is a Chen prime.

It is equal to p₈₃₇₉₁₄ and since 12813557 and 837914 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12813517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6406778 + 6406779.

It is an arithmetic number, because the mean of its divisors is an integer number (6406779).

Almost surely, 2^12813557 is an apocalyptic number.

It is an amenable number.

12813557 is a deficient number, since it is larger than the sum of its proper divisors (1).

12813557 is an equidigital number, since it uses as much as digits as its factorization.

12813557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 32.

The square root of 12813557 is about 3579.6029109386. The cubic root of 12813557 is about 234.0039751437.

The spelling of 12813557 in words is "twelve million, eight hundred thirteen thousand, five hundred fifty-seven".