22518233 has 2 divisors, whose sum is σ = 22518234. Its totient is φ = 22518232.

The previous prime is 22518229. The next prime is 22518271. The reversal of 22518233 is 33281522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21270544 + 1247689 = 4612^2 + 1117^2 .

It is a cyclic number.

It is not a de Polignac number, because 22518233 - 2² = 22518229 is a prime.

It is not a weakly prime, because it can be changed into another prime (22511233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11259116 + 11259117.

It is an arithmetic number, because the mean of its divisors is an integer number (11259117).

Almost surely, 2^22518233 is an apocalyptic number.

It is an amenable number.

22518233 is a deficient number, since it is larger than the sum of its proper divisors (1).

22518233 is an equidigital number, since it uses as much as digits as its factorization.

22518233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 26.

The square root of 22518233 is about 4745.3380280018. The cubic root of 22518233 is about 282.3870454524.

Adding to 22518233 its reverse (33281522), we get a palindrome (55799755).

The spelling of 22518233 in words is "twenty-two million, five hundred eighteen thousand, two hundred thirty-three".