225508999 has 4 divisors (see below), whose sum is σ = 226243864. Its totient is φ = 224774136.

The previous prime is 225508957. The next prime is 225509021. The reversal of 225508999 is 999805522.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999805522 = 2 ⋅499902761.

It is a cyclic number.

It is not a de Polignac number, because 225508999 - 2¹¹ = 225506951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225508909) 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 in 3 ways as a sum of consecutive naturals, for example, 366972 + ... + 367585.

It is an arithmetic number, because the mean of its divisors is an integer number (56560966).

Almost surely, 2^225508999 is an apocalyptic number.

225508999 is a deficient number, since it is larger than the sum of its proper divisors (734865).

225508999 is an equidigital number, since it uses as much as digits as its factorization.

225508999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734864.

The product of its (nonzero) digits is 583200, while the sum is 49.

The square root of 225508999 is about 15016.9570486167. The cubic root of 225508999 is about 608.6784963246.

The spelling of 225508999 in words is "two hundred twenty-five million, five hundred eight thousand, nine hundred ninety-nine".