228631891 has 8 divisors (see below), whose sum is σ = 238740480. Its totient is φ = 218537352.

The previous prime is 228631873. The next prime is 228631901. The reversal of 228631891 is 198136822.

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

It is not a de Polignac number, because 228631891 - 2⁷ = 228631763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228631801) 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, 43006 + ... + 48028.

It is an arithmetic number, because the mean of its divisors is an integer number (29842560).

Almost surely, 2^228631891 is an apocalyptic number.

228631891 is a deficient number, since it is larger than the sum of its proper divisors (10108589).

228631891 is a wasteful number, since it uses less digits than its factorization.

228631891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7025.

The product of its digits is 41472, while the sum is 40.

The square root of 228631891 is about 15120.5783950218. The cubic root of 228631891 is about 611.4753244142.

The spelling of 228631891 in words is "two hundred twenty-eight million, six hundred thirty-one thousand, eight hundred ninety-one".