22726217 has 2 divisors, whose sum is σ = 22726218. Its totient is φ = 22726216.

The previous prime is 22726181. The next prime is 22726219. The reversal of 22726217 is 71262722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14523721 + 8202496 = 3811^2 + 2864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22726217 is a prime.

Together with 22726219, 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 22726217.

It is not a weakly prime, because it can be changed into another prime (22726219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11363108 + 11363109.

It is an arithmetic number, because the mean of its divisors is an integer number (11363109).

Almost surely, 2^22726217 is an apocalyptic number.

It is an amenable number.

22726217 is a deficient number, since it is larger than the sum of its proper divisors (1).

22726217 is an equidigital number, since it uses as much as digits as its factorization.

22726217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4704, while the sum is 29.

The square root of 22726217 is about 4767.2022193316. The cubic root of 22726217 is about 283.2537814340.

Adding to 22726217 its reverse (71262722), we get a palindrome (93988939).

The spelling of 22726217 in words is "twenty-two million, seven hundred twenty-six thousand, two hundred seventeen".