22511225 has 24 divisors (see below), whose sum is σ = 30771840. Its totient is φ = 16200000.

The previous prime is 22511201. The next prime is 22511233. The reversal of 22511225 is 52211522.

It is a happy number.

It is not a de Polignac number, because 22511225 - 2¹⁸ = 22249081 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22511197 and 22511206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29600 + ... + 30350.

It is an arithmetic number, because the mean of its divisors is an integer number (1282160).

Almost surely, 2^22511225 is an apocalyptic number.

22511225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22511225 is a deficient number, since it is larger than the sum of its proper divisors (8260615).

22511225 is a wasteful number, since it uses less digits than its factorization.

22511225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881 (or 876 counting only the distinct ones).

The product of its digits is 400, while the sum is 20.

The square root of 22511225 is about 4744.5995616069. The cubic root of 22511225 is about 282.3577481012.

Adding to 22511225 its reverse (52211522), we get a palindrome (74722747).

The spelling of 22511225 in words is "twenty-two million, five hundred eleven thousand, two hundred twenty-five".