225530405 has 4 divisors (see below), whose sum is σ = 270636492. Its totient is φ = 180424320.

The previous prime is 225530401. The next prime is 225530413. The reversal of 225530405 is 504035522.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 89434849 + 136095556 = 9457^2 + 11666^2 .

It is not a de Polignac number, because 225530405 - 2² = 225530401 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 (225530401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22553036 + ... + 22553045.

It is an arithmetic number, because the mean of its divisors is an integer number (67659123).

Almost surely, 2^225530405 is an apocalyptic number.

It is an amenable number.

225530405 is a deficient number, since it is larger than the sum of its proper divisors (45106087).

225530405 is an equidigital number, since it uses as much as digits as its factorization.

225530405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45106086.

The product of its (nonzero) digits is 6000, while the sum is 26.

The square root of 225530405 is about 15017.6697593202. The cubic root of 225530405 is about 608.6977549199.

Adding to 225530405 its reverse (504035522), we get a palindrome (729565927).

The spelling of 225530405 in words is "two hundred twenty-five million, five hundred thirty thousand, four hundred five".