228148191 has 16 divisors (see below), whose sum is σ = 349653600. Its totient is φ = 146853504.

The previous prime is 228148187. The next prime is 228148223. The reversal of 228148191 is 191841822.

It is a happy number.

It is not a de Polignac number, because 228148191 - 2² = 228148187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228148391) 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 15 ways as a sum of consecutive naturals, for example, 144906 + ... + 146471.

It is an arithmetic number, because the mean of its divisors is an integer number (21853350).

Almost surely, 2^228148191 is an apocalyptic number.

228148191 is a deficient number, since it is larger than the sum of its proper divisors (121505409).

228148191 is a wasteful number, since it uses less digits than its factorization.

228148191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291415 (or 291409 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 228148191 is about 15104.5751678093. The cubic root of 228148191 is about 611.0438018784.

The spelling of 228148191 in words is "two hundred twenty-eight million, one hundred forty-eight thousand, one hundred ninety-one".