22565261 has 2 divisors, whose sum is σ = 22565262. Its totient is φ = 22565260.

The previous prime is 22565243. The next prime is 22565267. The reversal of 22565261 is 16256522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19307236 + 3258025 = 4394^2 + 1805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22565261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22565267) 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, 11282630 + 11282631.

It is an arithmetic number, because the mean of its divisors is an integer number (11282631).

Almost surely, 2^22565261 is an apocalyptic number.

It is an amenable number.

22565261 is a deficient number, since it is larger than the sum of its proper divisors (1).

22565261 is an equidigital number, since it uses as much as digits as its factorization.

22565261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 29.

The square root of 22565261 is about 4750.2906226883. The cubic root of 22565261 is about 282.5834916506.

The spelling of 22565261 in words is "twenty-two million, five hundred sixty-five thousand, two hundred sixty-one".