225728291 has 4 divisors (see below), whose sum is σ = 226124184. Its totient is φ = 225332400.

The previous prime is 225728281. The next prime is 225728299. The reversal of 225728291 is 192827522.

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: 192827522 = 2 ⋅96413761.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225728291 is a prime.

It is a super-2 number, since 2×225728291² = 101906522715561362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225728299) 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, 197090 + ... + 198231.

It is an arithmetic number, because the mean of its divisors is an integer number (56531046).

Almost surely, 2^225728291 is an apocalyptic number.

225728291 is a deficient number, since it is larger than the sum of its proper divisors (395893).

225728291 is an equidigital number, since it uses as much as digits as its factorization.

225728291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395892.

The product of its digits is 40320, while the sum is 38.

The square root of 225728291 is about 15024.2567536634. The cubic root of 225728291 is about 608.8757317381.

The spelling of 225728291 in words is "two hundred twenty-five million, seven hundred twenty-eight thousand, two hundred ninety-one".