228512117 has 4 divisors (see below), whose sum is σ = 228543840. Its totient is φ = 228480396.

The previous prime is 228512093. The next prime is 228512131. The reversal of 228512117 is 711215822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 711215822 = 2 ⋅355607911.

It is a cyclic number.

It is not a de Polignac number, because 228512117 - 2²⁰ = 227463541 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 228512117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228512177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 728 + ... + 21390.

It is an arithmetic number, because the mean of its divisors is an integer number (57135960).

Almost surely, 2^228512117 is an apocalyptic number.

It is an amenable number.

228512117 is a deficient number, since it is larger than the sum of its proper divisors (31723).

228512117 is a wasteful number, since it uses less digits than its factorization.

228512117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31722.

The product of its digits is 2240, while the sum is 29.

The square root of 228512117 is about 15116.6172472548. The cubic root of 228512117 is about 611.3685273583.

Adding to 228512117 its reverse (711215822), we get a palindrome (939727939).

The spelling of 228512117 in words is "two hundred twenty-eight million, five hundred twelve thousand, one hundred seventeen".