22545521 has 2 divisors, whose sum is σ = 22545522. Its totient is φ = 22545520.

The previous prime is 22545503. The next prime is 22545529. The reversal of 22545521 is 12554522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21715600 + 829921 = 4660^2 + 911^2 .

It is a cyclic number.

It is not a de Polignac number, because 22545521 - 2¹⁰ = 22544497 is a prime.

It is a super-2 number, since 2×22545521² = 1016601034322882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (22545529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11272760 + 11272761.

It is an arithmetic number, because the mean of its divisors is an integer number (11272761).

Almost surely, 2^22545521 is an apocalyptic number.

It is an amenable number.

22545521 is a deficient number, since it is larger than the sum of its proper divisors (1).

22545521 is an equidigital number, since it uses as much as digits as its factorization.

22545521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4000, while the sum is 26.

The square root of 22545521 is about 4748.2124004724. The cubic root of 22545521 is about 282.5010666418.

Subtracting from 22545521 its reverse (12554522), we obtain a palindrome (9990999).

The spelling of 22545521 in words is "twenty-two million, five hundred forty-five thousand, five hundred twenty-one".