228133187 has 4 divisors (see below), whose sum is σ = 228398400. Its totient is φ = 227867976.

The previous prime is 228133181. The next prime is 228133201. The reversal of 228133187 is 781331822.

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 228133187 - 2¹² = 228129091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228133181) 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, 131312 + ... + 133037.

It is an arithmetic number, because the mean of its divisors is an integer number (57099600).

Almost surely, 2^228133187 is an apocalyptic number.

228133187 is a deficient number, since it is larger than the sum of its proper divisors (265213).

228133187 is an equidigital number, since it uses as much as digits as its factorization.

228133187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265212.

The product of its digits is 16128, while the sum is 35.

The square root of 228133187 is about 15104.0784889380. The cubic root of 228133187 is about 611.0304066342.

The spelling of 228133187 in words is "two hundred twenty-eight million, one hundred thirty-three thousand, one hundred eighty-seven".