22551281 has 2 divisors, whose sum is σ = 22551282. Its totient is φ = 22551280.

The previous prime is 22551251. The next prime is 22551283. The reversal of 22551281 is 18215522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14371681 + 8179600 = 3791^2 + 2860^2 .

It is a cyclic number.

It is not a de Polignac number, because 22551281 - 2²² = 18356977 is a prime.

It is a super-2 number, since 2×22551281² = 1017120549481922, which contains 22 as substring.

Together with 22551283, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22551281.

It is not a weakly prime, because it can be changed into another prime (22551283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11275640 + 11275641.

It is an arithmetic number, because the mean of its divisors is an integer number (11275641).

Almost surely, 2^22551281 is an apocalyptic number.

It is an amenable number.

22551281 is a deficient number, since it is larger than the sum of its proper divisors (1).

22551281 is an equidigital number, since it uses as much as digits as its factorization.

22551281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1600, while the sum is 26.

The square root of 22551281 is about 4748.8189057912. The cubic root of 22551281 is about 282.5251226777.

The spelling of 22551281 in words is "twenty-two million, five hundred fifty-one thousand, two hundred eighty-one".