22715225 has 24 divisors (see below), whose sum is σ = 31169880. Its totient is φ = 16312320.

The previous prime is 22715221. The next prime is 22715227. The reversal of 22715225 is 52251722.

It can be written as a sum of positive squares in 12 ways, for example, as 5442889 + 17272336 = 2333^2 + 4156^2 .

It is not a de Polignac number, because 22715225 - 2² = 22715221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22715194 and 22715203.

It is not an unprimeable number, because it can be changed into a prime (22715221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11081 + ... + 12969.

It is an arithmetic number, because the mean of its divisors is an integer number (1298745).

Almost surely, 2^22715225 is an apocalyptic number.

22715225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22715225 is a deficient number, since it is larger than the sum of its proper divisors (8454655).

22715225 is a wasteful number, since it uses less digits than its factorization.

22715225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1949 (or 1944 counting only the distinct ones).

The product of its digits is 2800, while the sum is 26.

The square root of 22715225 is about 4766.0492024317. The cubic root of 22715225 is about 283.2081069064.

Adding to 22715225 its reverse (52251722), we get a palindrome (74966947).

The spelling of 22715225 in words is "twenty-two million, seven hundred fifteen thousand, two hundred twenty-five".