22516225 has 6 divisors (see below), whose sum is σ = 27920150. Its totient is φ = 18012960.

The previous prime is 22516213. The next prime is 22516237. The reversal of 22516225 is 52261522.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22516213) and next prime (22516237).

It can be written as a sum of positive squares in 3 ways, for example, as 651249 + 21864976 = 807^2 + 4676^2 .

It is not a de Polignac number, because 22516225 - 2⁷ = 22516097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 900649 = 22516225 / (2 + 2 + 5 + 1 + 6 + 2 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 22516225.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 450300 + ... + 450349.

Almost surely, 2^22516225 is an apocalyptic number.

22516225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22516225 is a deficient number, since it is larger than the sum of its proper divisors (5403925).

22516225 is an equidigital number, since it uses as much as digits as its factorization.

22516225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900659 (or 900654 counting only the distinct ones).

The product of its digits is 2400, while the sum is 25.

The square root of 22516225 is about 4745.1264472088. The cubic root of 22516225 is about 282.3786515131.

Adding to 22516225 its reverse (52261522), we get a palindrome (74777747).

The spelling of 22516225 in words is "twenty-two million, five hundred sixteen thousand, two hundred twenty-five".