2565831 has 4 divisors (see below), whose sum is σ = 3421112. Its totient is φ = 1710552.

The previous prime is 2565809. The next prime is 2565847. The reversal of 2565831 is 1385652.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2565831 - 2⁵ = 2565799 is a prime.

It is a super-2 number, since 2×2565831² = 13166977441122, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 427636 + ... + 427641.

It is an arithmetic number, because the mean of its divisors is an integer number (855278).

2^2565831 is an apocalyptic number.

2565831 is a deficient number, since it is larger than the sum of its proper divisors (855281).

2565831 is an equidigital number, since it uses as much as digits as its factorization.

2565831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855280.

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

The square root of 2565831 is about 1601.8211510652. The cubic root of 2565831 is about 136.9018602027.

It can be divided in two parts, 25 and 65831, that added together give a palindrome (65856).

The spelling of 2565831 in words is "two million, five hundred sixty-five thousand, eight hundred thirty-one".