2569649 has 2 divisors, whose sum is σ = 2569650. Its totient is φ = 2569648.

The previous prime is 2569607. The next prime is 2569667. The reversal of 2569649 is 9469652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1288225 + 1281424 = 1135^2 + 1132^2 .

It is a cyclic number.

It is not a de Polignac number, because 2569649 - 2⁸ = 2569393 is a prime.

It is not a weakly prime, because it can be changed into another prime (2569549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1284824 + 1284825.

It is an arithmetic number, because the mean of its divisors is an integer number (1284825).

2^2569649 is an apocalyptic number.

It is an amenable number.

2569649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2569649 is an equidigital number, since it uses as much as digits as its factorization.

2569649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 41.

The square root of 2569649 is about 1603.0124765578. The cubic root of 2569649 is about 136.9697306455.

The spelling of 2569649 in words is "two million, five hundred sixty-nine thousand, six hundred forty-nine".