2566401 has 4 divisors (see below), whose sum is σ = 3421872. Its totient is φ = 1710932.

The previous prime is 2566367. The next prime is 2566411. The reversal of 2566401 is 1046652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2566401 - 2¹⁰ = 2565377 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (2566411) 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, 427731 + ... + 427736.

It is an arithmetic number, because the mean of its divisors is an integer number (855468).

2^2566401 is an apocalyptic number.

It is an amenable number.

2566401 is a deficient number, since it is larger than the sum of its proper divisors (855471).

2566401 is an equidigital number, since it uses as much as digits as its factorization.

2566401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855470.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 2566401 is about 1601.9990636701. Note that the first 3 decimals coincide. The cubic root of 2566401 is about 136.9119970463.

The spelling of 2566401 in words is "two million, five hundred sixty-six thousand, four hundred one".