228016991 has 8 divisors (see below), whose sum is σ = 230445600. Its totient is φ = 225594720.

The previous prime is 228016979. The next prime is 228016993. The reversal of 228016991 is 199610822.

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 228016991 - 2⁶ = 228016927 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 (228016993) 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 7 ways as a sum of consecutive naturals, for example, 111365 + ... + 113393.

It is an arithmetic number, because the mean of its divisors is an integer number (28805700).

Almost surely, 2^228016991 is an apocalyptic number.

228016991 is a deficient number, since it is larger than the sum of its proper divisors (2428609).

228016991 is a wasteful number, since it uses less digits than its factorization.

228016991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3169.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 228016991 is about 15100.2314882918. The cubic root of 228016991 is about 610.9266494860.

It can be divided in two parts, 22801 and 6991, that added together give a palindrome (29792).

The spelling of 228016991 in words is "two hundred twenty-eight million, sixteen thousand, nine hundred ninety-one".