2564491 has 4 divisors (see below), whose sum is σ = 2589984. Its totient is φ = 2539000.

The previous prime is 2564489. The next prime is 2564519. The reversal of 2564491 is 1944652.

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 2564491 - 2¹ = 2564489 is a prime.

It is a super-2 number, since 2×2564491² = 13153228178162, which contains 22 as substring.

It is a Duffinian number.

2564491 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2561491) 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, 12595 + ... + 12796.

It is an arithmetic number, because the mean of its divisors is an integer number (647496).

2^2564491 is an apocalyptic number.

2564491 is a deficient number, since it is larger than the sum of its proper divisors (25493).

2564491 is a wasteful number, since it uses less digits than its factorization.

2564491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25492.

The product of its digits is 8640, while the sum is 31.

The square root of 2564491 is about 1601.4028225278. The cubic root of 2564491 is about 136.8780238137.

It can be divided in two parts, 25 and 64491, that added together give a square (64516 = 254²).

The spelling of 2564491 in words is "two million, five hundred sixty-four thousand, four hundred ninety-one".