228631187 has 4 divisors (see below), whose sum is σ = 228830976. Its totient is φ = 228431400.

The previous prime is 228631153. The next prime is 228631213. The reversal of 228631187 is 781136822.

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 228631187 - 2¹⁰ = 228630163 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 228631187.

It is not an unprimeable number, because it can be changed into a prime (228631087) 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, 98168 + ... + 100469.

It is an arithmetic number, because the mean of its divisors is an integer number (57207744).

Almost surely, 2^228631187 is an apocalyptic number.

228631187 is a deficient number, since it is larger than the sum of its proper divisors (199789).

228631187 is a wasteful number, since it uses less digits than its factorization.

228631187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199788.

The product of its digits is 32256, while the sum is 38.

The square root of 228631187 is about 15120.5551154711. Note that the first 3 decimals coincide. The cubic root of 228631187 is about 611.4746967982.

The spelling of 228631187 in words is "two hundred twenty-eight million, six hundred thirty-one thousand, one hundred eighty-seven".