2256621 has 4 divisors (see below), whose sum is σ = 3008832. Its totient is φ = 1504412.

The previous prime is 2256619. The next prime is 2256623. The reversal of 2256621 is 1266522.

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 an interprime number because it is at equal distance from previous prime (2256619) and next prime (2256623).

It is a cyclic number.

It is not a de Polignac number, because 2256621 - 2¹ = 2256619 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 2256591 and 2256600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2256623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 376101 + ... + 376106.

It is an arithmetic number, because the mean of its divisors is an integer number (752208).

2^2256621 is an apocalyptic number.

It is an amenable number.

2256621 is a deficient number, since it is larger than the sum of its proper divisors (752211).

2256621 is an equidigital number, since it uses as much as digits as its factorization.

2256621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752210.

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

The square root of 2256621 is about 1502.2053787682. The cubic root of 2256621 is about 131.1654766455.

Subtracting from 2256621 its reverse (1266522), we obtain a palindrome (990099).

The spelling of 2256621 in words is "two million, two hundred fifty-six thousand, six hundred twenty-one".