228131187 has 8 divisors (see below), whose sum is σ = 304258704. Its totient is φ = 152045568.

The previous prime is 228131153. The next prime is 228131203. The reversal of 228131187 is 781131822.

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

It is not a de Polignac number, because 228131187 - 2¹⁵ = 228098419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (228131107) 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 7 ways as a sum of consecutive naturals, for example, 5883 + ... + 22155.

It is an arithmetic number, because the mean of its divisors is an integer number (38032338).

Almost surely, 2^228131187 is an apocalyptic number.

228131187 is a deficient number, since it is larger than the sum of its proper divisors (76127517).

228131187 is a wasteful number, since it uses less digits than its factorization.

228131187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20949.

The product of its digits is 5376, while the sum is 33.

The square root of 228131187 is about 15104.0122815098. The cubic root of 228131187 is about 611.0286210334.

The spelling of 228131187 in words is "two hundred twenty-eight million, one hundred thirty-one thousand, one hundred eighty-seven".