2565931 has 4 divisors (see below), whose sum is σ = 2701000. Its totient is φ = 2430864.

The previous prime is 2565917. The next prime is 2565947. The reversal of 2565931 is 1395652.

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

It is a cyclic number.

It is not a de Polignac number, because 2565931 - 2¹⁵ = 2533163 is a prime.

It is a super-2 number, since 2×2565931² = 13168003793522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2565893 and 2565902.

It is not an unprimeable number, because it can be changed into a prime (2566931) 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, 67506 + ... + 67543.

It is an arithmetic number, because the mean of its divisors is an integer number (675250).

2^2565931 is an apocalyptic number.

2565931 is a deficient number, since it is larger than the sum of its proper divisors (135069).

2565931 is a wasteful number, since it uses less digits than its factorization.

2565931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135068.

The product of its digits is 8100, while the sum is 31.

The square root of 2565931 is about 1601.8523652322. The cubic root of 2565931 is about 136.9036387049.

It can be divided in two parts, 25 and 65931, that added together give a palindrome (65956).

The spelling of 2565931 in words is "two million, five hundred sixty-five thousand, nine hundred thirty-one".