2255621 has 2 divisors, whose sum is σ = 2255622. Its totient is φ = 2255620.

The previous prime is 2255609. The next prime is 2255639. The reversal of 2255621 is 1265522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2070721 + 184900 = 1439^2 + 430^2 .

It is a cyclic number.

It is not a de Polignac number, because 2255621 - 2¹⁸ = 1993477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2255681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1127810 + 1127811.

It is an arithmetic number, because the mean of its divisors is an integer number (1127811).

2^2255621 is an apocalyptic number.

It is an amenable number.

2255621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2255621 is an equidigital number, since it uses as much as digits as its factorization.

2255621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1200, while the sum is 23.

The square root of 2255621 is about 1501.8724979172. The cubic root of 2255621 is about 131.1460988743.

Subtracting from 2255621 its reverse (1265522), we obtain a palindrome (990099).

The spelling of 2255621 in words is "two million, two hundred fifty-five thousand, six hundred twenty-one".