2565881 has 2 divisors, whose sum is σ = 2565882. Its totient is φ = 2565880.

The previous prime is 2565863. The next prime is 2565907. The reversal of 2565881 is 1885652.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2131600 + 434281 = 1460^2 + 659^2 .

It is a cyclic number.

It is not a de Polignac number, because 2565881 - 2¹⁰ = 2564857 is a prime.

It is a super-2 number, since 2×2565881² = 13167490612322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2562881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282940 + 1282941.

It is an arithmetic number, because the mean of its divisors is an integer number (1282941).

2^2565881 is an apocalyptic number.

It is an amenable number.

2565881 is a deficient number, since it is larger than the sum of its proper divisors (1).

2565881 is an equidigital number, since it uses as much as digits as its factorization.

2565881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19200, while the sum is 35.

The square root of 2565881 is about 1601.8367582248. The cubic root of 2565881 is about 136.9027494595.

The spelling of 2565881 in words is "two million, five hundred sixty-five thousand, eight hundred eighty-one".