2556569 has 2 divisors, whose sum is σ = 2556570. Its totient is φ = 2556568.

The previous prime is 2556559. The next prime is 2556577. The reversal of 2556569 is 9656552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2544025 + 12544 = 1595^2 + 112^2 .

It is a cyclic number.

It is not a de Polignac number, because 2556569 - 2²⁰ = 1507993 is a prime.

It is a super-2 number, since 2×2556569² = 13072090103522, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (2556509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278284 + 1278285.

It is an arithmetic number, because the mean of its divisors is an integer number (1278285).

2^2556569 is an apocalyptic number.

It is an amenable number.

2556569 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556569 is an equidigital number, since it uses as much as digits as its factorization.

2556569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81000, while the sum is 38.

The square root of 2556569 is about 1598.9274530134. The cubic root of 2556569 is about 136.7369345837.

It can be divided in two parts, 2556 and 569, that added together give a 5-th power (3125 = 5⁵).

The spelling of 2556569 in words is "two million, five hundred fifty-six thousand, five hundred sixty-nine".