12557197 has 2 divisors, whose sum is σ = 12557198. Its totient is φ = 12557196.

The previous prime is 12557191. The next prime is 12557213. The reversal of 12557197 is 79175521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8003241 + 4553956 = 2829^2 + 2134^2 .

It is a cyclic number.

It is not a de Polignac number, because 12557197 - 2¹¹ = 12555149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12557191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6278598 + 6278599.

It is an arithmetic number, because the mean of its divisors is an integer number (6278599).

Almost surely, 2^12557197 is an apocalyptic number.

It is an amenable number.

12557197 is a deficient number, since it is larger than the sum of its proper divisors (1).

12557197 is an equidigital number, since it uses as much as digits as its factorization.

12557197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22050, while the sum is 37.

The square root of 12557197 is about 3543.6135511650. The cubic root of 12557197 is about 232.4328830819.

The spelling of 12557197 in words is "twelve million, five hundred fifty-seven thousand, one hundred ninety-seven".