12642569 has 2 divisors, whose sum is σ = 12642570. Its totient is φ = 12642568.

The previous prime is 12642547. The next prime is 12642587. The reversal of 12642569 is 96524621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10316944 + 2325625 = 3212^2 + 1525^2 .

It is an emirp because it is prime and its reverse (96524621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12642569 is a prime.

It is a super-2 number, since 2×12642569² = 319669101839522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12642589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6321284 + 6321285.

It is an arithmetic number, because the mean of its divisors is an integer number (6321285).

Almost surely, 2^12642569 is an apocalyptic number.

It is an amenable number.

12642569 is a deficient number, since it is larger than the sum of its proper divisors (1).

12642569 is an equidigital number, since it uses as much as digits as its factorization.

12642569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 35.

The square root of 12642569 is about 3555.6390424226. The cubic root of 12642569 is about 232.9584372069.

The spelling of 12642569 in words is "twelve million, six hundred forty-two thousand, five hundred sixty-nine".