12197557 has 2 divisors, whose sum is σ = 12197558. Its totient is φ = 12197556.

The previous prime is 12197527. The next prime is 12197593. The reversal of 12197557 is 75579121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12068676 + 128881 = 3474^2 + 359^2 .

It is an emirp because it is prime and its reverse (75579121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12197557 is a prime.

It is the 3493-rd Hogben number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12197527) by changing a digit.

It is a nontrivial repunit in base 3492.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6098778 + 6098779.

It is an arithmetic number, because the mean of its divisors is an integer number (6098779).

Almost surely, 2^12197557 is an apocalyptic number.

It is an amenable number.

12197557 is a deficient number, since it is larger than the sum of its proper divisors (1).

12197557 is an equidigital number, since it uses as much as digits as its factorization.

12197557 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 12197557 is about 3492.5001073729. The cubic root of 12197557 is about 230.1923847176.

The spelling of 12197557 in words is "twelve million, one hundred ninety-seven thousand, five hundred fifty-seven".