228319187 has 4 divisors (see below), whose sum is σ = 228513696. Its totient is φ = 228124680.

The previous prime is 228319171. The next prime is 228319213. The reversal of 228319187 is 781913822.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 228319187 - 2⁴ = 228319171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228319787) 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, 95483 + ... + 97844.

It is an arithmetic number, because the mean of its divisors is an integer number (57128424).

Almost surely, 2^228319187 is an apocalyptic number.

228319187 is a deficient number, since it is larger than the sum of its proper divisors (194509).

228319187 is a wasteful number, since it uses less digits than its factorization.

228319187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194508.

The product of its digits is 48384, while the sum is 41.

The square root of 228319187 is about 15110.2345117473. The cubic root of 228319187 is about 611.1964219107.

The spelling of 228319187 in words is "two hundred twenty-eight million, three hundred nineteen thousand, one hundred eighty-seven".