225744905 has 4 divisors (see below), whose sum is σ = 270893892. Its totient is φ = 180595920.

The previous prime is 225744809. The next prime is 225744923. The reversal of 225744905 is 509447522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 509447522 = 2 ⋅254723761.

It can be written as a sum of positive squares in 2 ways, for example, as 121969936 + 103774969 = 11044^2 + 10187^2 .

It is not a de Polignac number, because 225744905 - 2²⁶ = 158636041 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22574486 + ... + 22574495.

It is an arithmetic number, because the mean of its divisors is an integer number (67723473).

Almost surely, 2^225744905 is an apocalyptic number.

It is an amenable number.

225744905 is a deficient number, since it is larger than the sum of its proper divisors (45148987).

225744905 is an equidigital number, since it uses as much as digits as its factorization.

225744905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45148986.

The product of its (nonzero) digits is 100800, while the sum is 38.

The square root of 225744905 is about 15024.8096493766. The cubic root of 225744905 is about 608.8906694806.

The spelling of 225744905 in words is "two hundred twenty-five million, seven hundred forty-four thousand, nine hundred five".