22518229 has 2 divisors, whose sum is σ = 22518230. Its totient is φ = 22518228.

The previous prime is 22518193. The next prime is 22518233. The reversal of 22518229 is 92281522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16402500 + 6115729 = 4050^2 + 2473^2 .

It is a cyclic number.

It is not a de Polignac number, because 22518229 - 2¹⁵ = 22485461 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22518229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22518329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11259114 + 11259115.

It is an arithmetic number, because the mean of its divisors is an integer number (11259115).

Almost surely, 2^22518229 is an apocalyptic number.

It is an amenable number.

22518229 is a deficient number, since it is larger than the sum of its proper divisors (1).

22518229 is an equidigital number, since it uses as much as digits as its factorization.

22518229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 31.

The square root of 22518229 is about 4745.3376065355. The cubic root of 22518229 is about 282.3870287319.

The spelling of 22518229 in words is "twenty-two million, five hundred eighteen thousand, two hundred twenty-nine".