22531225 has 6 divisors (see below), whose sum is σ = 27938750. Its totient is φ = 18024960.

The previous prime is 22531217. The next prime is 22531241. The reversal of 22531225 is 52213522.

It can be written as a sum of positive squares in 3 ways, for example, as 177241 + 22353984 = 421^2 + 4728^2 .

It is not a de Polignac number, because 22531225 - 2³ = 22531217 is a prime.

It is a super-2 number, since 2×22531225² = 1015312200001250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22531196 and 22531205.

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, 450600 + ... + 450649.

Almost surely, 2^22531225 is an apocalyptic number.

22531225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22531225 is a deficient number, since it is larger than the sum of its proper divisors (5407525).

22531225 is an equidigital number, since it uses as much as digits as its factorization.

22531225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901259 (or 901254 counting only the distinct ones).

The product of its digits is 1200, while the sum is 22.

The square root of 22531225 is about 4746.7067531079. The cubic root of 22531225 is about 282.4413431875.

Adding to 22531225 its reverse (52213522), we get a palindrome (74744747).

The spelling of 22531225 in words is "twenty-two million, five hundred thirty-one thousand, two hundred twenty-five".