22817 has 2 divisors, whose sum is σ = 22818. Its totient is φ = 22816.

The previous prime is 22811. The next prime is 22853. The reversal of 22817 is 71822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22801 + 16 = 151^2 + 4^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22817 is a prime.

It is a Chen prime.

It is a plaindrome in base 7 and base 12.

It is a nialpdrome in base 8.

It is not a weakly prime, because it can be changed into another prime (22811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11408 + 11409.

It is an arithmetic number, because the mean of its divisors is an integer number (11409).

2²²⁸¹⁷ is an apocalyptic number.

It is an amenable number.

22817 is a deficient number, since it is larger than the sum of its proper divisors (1).

22817 is an equidigital number, since it uses as much as digits as its factorization.

22817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 224, while the sum is 20.

The square root of 22817 is about 151.0529708414. The cubic root of 22817 is about 28.3630445731.

The spelling of 22817 in words is "twenty-two thousand, eight hundred seventeen".