2256557 has 2 divisors, whose sum is σ = 2256558. Its totient is φ = 2256556.

The previous prime is 2256539. The next prime is 2256559. The reversal of 2256557 is 7556522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2157961 + 98596 = 1469^2 + 314^2 .

It is a cyclic number.

It is not a de Polignac number, because 2256557 - 2¹² = 2252461 is a prime.

Together with 2256559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2256559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1128278 + 1128279.

It is an arithmetic number, because the mean of its divisors is an integer number (1128279).

2^2256557 is an apocalyptic number.

It is an amenable number.

2256557 is a deficient number, since it is larger than the sum of its proper divisors (1).

2256557 is an equidigital number, since it uses as much as digits as its factorization.

2256557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21000, while the sum is 32.

The square root of 2256557 is about 1502.1840766031. The cubic root of 2256557 is about 131.1642366396.

It can be divided in two parts, 22565 and 57, that added together give a palindrome (22622).

The spelling of 2256557 in words is "two million, two hundred fifty-six thousand, five hundred fifty-seven".