225540331 has 2 divisors, whose sum is σ = 225540332. Its totient is φ = 225540330.

The previous prime is 225540311. The next prime is 225540349. The reversal of 225540331 is 133045522.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 225540331 - 2¹¹ = 225538283 is a prime.

It is a super-2 number, since 2×225540331² = 101736881815179122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 225540296 and 225540305.

It is not a weakly prime, because it can be changed into another prime (225540311) by changing a digit.

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 as a sum of consecutive naturals, namely, 112770165 + 112770166.

It is an arithmetic number, because the mean of its divisors is an integer number (112770166).

Almost surely, 2^225540331 is an apocalyptic number.

225540331 is a deficient number, since it is larger than the sum of its proper divisors (1).

225540331 is an equidigital number, since it uses as much as digits as its factorization.

225540331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 225540331 is about 15018.0002330537. Note that the first 3 decimals coincide. The cubic root of 225540331 is about 608.7066847510.

Adding to 225540331 its reverse (133045522), we get a palindrome (358585853).

The spelling of 225540331 in words is "two hundred twenty-five million, five hundred forty thousand, three hundred thirty-one".