22556257 has 2 divisors, whose sum is σ = 22556258. Its totient is φ = 22556256.

The previous prime is 22556239. The next prime is 22556267. The reversal of 22556257 is 75265522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22268961 + 287296 = 4719^2 + 536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22556257 is a prime.

It is not a weakly prime, because it can be changed into another prime (22556267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11278128 + 11278129.

It is an arithmetic number, because the mean of its divisors is an integer number (11278129).

Almost surely, 2^22556257 is an apocalyptic number.

It is an amenable number.

22556257 is a deficient number, since it is larger than the sum of its proper divisors (1).

22556257 is an equidigital number, since it uses as much as digits as its factorization.

22556257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42000, while the sum is 34.

The square root of 22556257 is about 4749.3427966404. The cubic root of 22556257 is about 282.5459011222.

The spelling of 22556257 in words is "twenty-two million, five hundred fifty-six thousand, two hundred fifty-seven".