2565989 has 2 divisors, whose sum is σ = 2565990. Its totient is φ = 2565988.

The previous prime is 2565947. The next prime is 2566001. The reversal of 2565989 is 9895652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2356225 + 209764 = 1535^2 + 458^2 .

It is a cyclic number.

It is not a de Polignac number, because 2565989 - 2²⁰ = 1517413 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2565089) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282994 + 1282995.

It is an arithmetic number, because the mean of its divisors is an integer number (1282995).

2^2565989 is an apocalyptic number.

It is an amenable number.

2565989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2565989 is an equidigital number, since it uses as much as digits as its factorization.

2565989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 44.

The square root of 2565989 is about 1601.8704691703. The cubic root of 2565989 is about 136.9046702150.

The spelling of 2565989 in words is "two million, five hundred sixty-five thousand, nine hundred eighty-nine".