225120505 has 4 divisors (see below), whose sum is σ = 270144612. Its totient is φ = 180096400.

The previous prime is 225120503. The next prime is 225120551. The reversal of 225120505 is 505021522.

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 180069561 + 45050944 = 13419^2 + 6712^2 .

It is not a de Polignac number, because 225120505 - 2¹ = 225120503 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225120503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22512046 + ... + 22512055.

It is an arithmetic number, because the mean of its divisors is an integer number (67536153).

Almost surely, 2^225120505 is an apocalyptic number.

It is an amenable number.

225120505 is a deficient number, since it is larger than the sum of its proper divisors (45024107).

225120505 is an equidigital number, since it uses as much as digits as its factorization.

225120505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45024106.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 225120505 is about 15004.0162956456. The cubic root of 225120505 is about 608.3287632525.

It can be divided in two parts, 225120 and 505, that added together give a square (225625 = 475²).

The spelling of 225120505 in words is "two hundred twenty-five million, one hundred twenty thousand, five hundred five".