228512257 has 4 divisors (see below), whose sum is σ = 236392020. Its totient is φ = 220632496.

The previous prime is 228512239. The next prime is 228512267. The reversal of 228512257 is 752215822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 752215822 = 2 ⋅376107911.

It can be written as a sum of positive squares in 2 ways, for example, as 195748081 + 32764176 = 13991^2 + 5724^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228512257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228512237) 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, 3939838 + ... + 3939895.

It is an arithmetic number, because the mean of its divisors is an integer number (59098005).

Almost surely, 2^228512257 is an apocalyptic number.

It is an amenable number.

228512257 is a deficient number, since it is larger than the sum of its proper divisors (7879763).

228512257 is an equidigital number, since it uses as much as digits as its factorization.

228512257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7879762.

The product of its digits is 22400, while the sum is 34.

The square root of 228512257 is about 15116.6218779197. The cubic root of 228512257 is about 611.3686522118.

The spelling of 228512257 in words is "two hundred twenty-eight million, five hundred twelve thousand, two hundred fifty-seven".