228117917 has 8 divisors (see below), whose sum is σ = 242235000. Its totient is φ = 214078464.

The previous prime is 228117899. The next prime is 228117937. The reversal of 228117917 is 719711822.

It can be written as a sum of positive squares in 4 ways, for example, as 22080601 + 206037316 = 4699^2 + 14354^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 228117917 - 2⁶ = 228117853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228117937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13292 + ... + 25157.

It is an arithmetic number, because the mean of its divisors is an integer number (30279375).

Almost surely, 2^228117917 is an apocalyptic number.

It is an amenable number.

228117917 is a deficient number, since it is larger than the sum of its proper divisors (14117083).

228117917 is a wasteful number, since it uses less digits than its factorization.

228117917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38815.

The product of its digits is 14112, while the sum is 38.

The square root of 228117917 is about 15103.5729878728. The cubic root of 228117917 is about 611.0167733080.

The spelling of 228117917 in words is "two hundred twenty-eight million, one hundred seventeen thousand, nine hundred seventeen".