228991371 has 8 divisors (see below), whose sum is σ = 348939264. Its totient is φ = 130852200.

The previous prime is 228991339. The next prime is 228991391. The reversal of 228991371 is 173199822.

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

It is not a de Polignac number, because 228991371 - 2⁵ = 228991339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (228991391) 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, 5452155 + ... + 5452196.

It is an arithmetic number, because the mean of its divisors is an integer number (43617408).

Almost surely, 2^228991371 is an apocalyptic number.

228991371 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

228991371 is a deficient number, since it is larger than the sum of its proper divisors (119947893).

228991371 is a wasteful number, since it uses less digits than its factorization.

228991371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10904361.

The product of its digits is 54432, while the sum is 42.

The square root of 228991371 is about 15132.4608375505. The cubic root of 228991371 is about 611.7956326681.

The spelling of 228991371 in words is "two hundred twenty-eight million, nine hundred ninety-one thousand, three hundred seventy-one".