228532991 has 8 divisors (see below), whose sum is σ = 238650720. Its totient is φ = 218430432.

The previous prime is 228532981. The next prime is 228533027. The reversal of 228532991 is 199235822.

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 228532991 - 2²² = 224338687 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 (228532981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36005 + ... + 41873.

It is an arithmetic number, because the mean of its divisors is an integer number (29831340).

Almost surely, 2^228532991 is an apocalyptic number.

228532991 is a deficient number, since it is larger than the sum of its proper divisors (10117729).

228532991 is a wasteful number, since it uses less digits than its factorization.

228532991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7585.

The product of its digits is 77760, while the sum is 41.

The square root of 228532991 is about 15117.3076637343. The cubic root of 228532991 is about 611.3871424442.

The spelling of 228532991 in words is "two hundred twenty-eight million, five hundred thirty-two thousand, nine hundred ninety-one".