2565381 has 16 divisors (see below), whose sum is σ = 4210304. Its totient is φ = 1353024.

The previous prime is 2565377. The next prime is 2565383. The reversal of 2565381 is 1835652.

It is not a de Polignac number, because 2565381 - 2² = 2565377 is a prime.

It is a super-5 number, since 5×2565381⁵ (a number of 33 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4426 + ... + 4971.

It is an arithmetic number, because the mean of its divisors is an integer number (263144).

2^2565381 is an apocalyptic number.

2565381 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2565381 is a deficient number, since it is larger than the sum of its proper divisors (1644923).

2565381 is a wasteful number, since it uses less digits than its factorization.

2565381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9420.

The product of its digits is 7200, while the sum is 30.

The square root of 2565381 is about 1601.6806797861. The cubic root of 2565381 is about 136.8938563709.

The spelling of 2565381 in words is "two million, five hundred sixty-five thousand, three hundred eighty-one".