228444991 has 16 divisors (see below), whose sum is σ = 237081600. Its totient is φ = 220025088.

The previous prime is 228444941. The next prime is 228445001. The reversal of 228444991 is 199444822.

It is a cyclic number.

It is not a de Polignac number, because 228444991 - 2⁹ = 228444479 is a prime.

It is a super-2 number, since 2×228444991² = 104374227825980162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228444941) 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 15 ways as a sum of consecutive naturals, for example, 1024306 + ... + 1024528.

It is an arithmetic number, because the mean of its divisors is an integer number (14817600).

Almost surely, 2^228444991 is an apocalyptic number.

228444991 is a deficient number, since it is larger than the sum of its proper divisors (8636609).

228444991 is a wasteful number, since it uses less digits than its factorization.

228444991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558.

The product of its digits is 165888, while the sum is 43.

The square root of 228444991 is about 15114.3968123111. The cubic root of 228444991 is about 611.3086578229.

The spelling of 228444991 in words is "two hundred twenty-eight million, four hundred forty-four thousand, nine hundred ninety-one".