228133871 has 4 divisors (see below), whose sum is σ = 260724432. Its totient is φ = 195543312.

The previous prime is 228133837. The next prime is 228133879. The reversal of 228133871 is 178331822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 178331822 = 2 ⋅89165911.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228133871 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 (228133879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16295270 + ... + 16295283.

It is an arithmetic number, because the mean of its divisors is an integer number (65181108).

Almost surely, 2^228133871 is an apocalyptic number.

228133871 is a deficient number, since it is larger than the sum of its proper divisors (32590561).

228133871 is an equidigital number, since it uses as much as digits as its factorization.

228133871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32590560.

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

The square root of 228133871 is about 15104.1011318118. The cubic root of 228133871 is about 611.0310173073.

The spelling of 228133871 in words is "two hundred twenty-eight million, one hundred thirty-three thousand, eight hundred seventy-one".