22518073 has 2 divisors, whose sum is σ = 22518074. Its totient is φ = 22518072.

The previous prime is 22518053. The next prime is 22518077. The reversal of 22518073 is 37081522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13227769 + 9290304 = 3637^2 + 3048^2 .

It is a cyclic number.

It is not a de Polignac number, because 22518073 - 2¹³ = 22509881 is a prime.

It is a super-2 number, since 2×22518073² = 1014127223266658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22518077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11259036 + 11259037.

It is an arithmetic number, because the mean of its divisors is an integer number (11259037).

Almost surely, 2^22518073 is an apocalyptic number.

It is an amenable number.

22518073 is a deficient number, since it is larger than the sum of its proper divisors (1).

22518073 is an equidigital number, since it uses as much as digits as its factorization.

22518073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 22518073 is about 4745.3211693204. The cubic root of 22518073 is about 282.3863766310.

Adding to 22518073 its reverse (37081522), we get a palindrome (59599595).

The spelling of 22518073 in words is "twenty-two million, five hundred eighteen thousand, seventy-three".