22587281 has 2 divisors, whose sum is σ = 22587282. Its totient is φ = 22587280.

The previous prime is 22587277. The next prime is 22587283. The reversal of 22587281 is 18278522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17297281 + 5290000 = 4159^2 + 2300^2 .

It is a cyclic number.

It is not a de Polignac number, because 22587281 - 2² = 22587277 is a prime.

It is a super-2 number, since 2×22587281² = 1020370525945922, which contains 22 as substring.

Together with 22587283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22587283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11293640 + 11293641.

It is an arithmetic number, because the mean of its divisors is an integer number (11293641).

Almost surely, 2^22587281 is an apocalyptic number.

It is an amenable number.

22587281 is a deficient number, since it is larger than the sum of its proper divisors (1).

22587281 is an equidigital number, since it uses as much as digits as its factorization.

22587281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17920, while the sum is 35.

The square root of 22587281 is about 4752.6078104552. The cubic root of 22587281 is about 282.6753801740.

The spelling of 22587281 in words is "twenty-two million, five hundred eighty-seven thousand, two hundred eighty-one".