2556361 has 4 divisors (see below), whose sum is σ = 2588800. Its totient is φ = 2523924.

The previous prime is 2556331. The next prime is 2556373. The reversal of 2556361 is 1636552.

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 2556361 - 2⁷ = 2556233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2556331) 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, 16101 + ... + 16258.

It is an arithmetic number, because the mean of its divisors is an integer number (647200).

2^2556361 is an apocalyptic number.

It is an amenable number.

2556361 is a deficient number, since it is larger than the sum of its proper divisors (32439).

2556361 is an equidigital number, since it uses as much as digits as its factorization.

2556361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32438.

The product of its digits is 5400, while the sum is 28.

The square root of 2556361 is about 1598.8624080890. The cubic root of 2556361 is about 136.7332262212.

The spelling of 2556361 in words is "two million, five hundred fifty-six thousand, three hundred sixty-one".