228191 has 8 divisors (see below), whose sum is σ = 249984. Its totient is φ = 207360.

The previous prime is 228181. The next prime is 228197. The reversal of 228191 is 191822.

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

It is a cyclic number.

It is not a de Polignac number, because 228191 - 2⁶ = 228127 is a prime.

It is a super-2 number, since 2×228191² = 104142264962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311 + ... + 743.

It is an arithmetic number, because the mean of its divisors is an integer number (31248).

2²²⁸¹⁹¹ is an apocalyptic number.

228191 is a deficient number, since it is larger than the sum of its proper divisors (21793).

228191 is a wasteful number, since it uses less digits than its factorization.

228191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481.

The product of its digits is 288, while the sum is 23.

The square root of 228191 is about 477.6934163247. The cubic root of 228191 is about 61.1082017593.

The spelling of 228191 in words is "two hundred twenty-eight thousand, one hundred ninety-one".