228912919 has 4 divisors (see below), whose sum is σ = 231272944. Its totient is φ = 226552896.

The previous prime is 228912917. The next prime is 228912941. The reversal of 228912919 is 919219822.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 228912919 - 2¹ = 228912917 is a prime.

It is a super-2 number, since 2×228912919² = 104802248970201122, 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 (228912917) 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 3 ways as a sum of consecutive naturals, for example, 1179867 + ... + 1180060.

It is an arithmetic number, because the mean of its divisors is an integer number (57818236).

Almost surely, 2^228912919 is an apocalyptic number.

228912919 is a deficient number, since it is larger than the sum of its proper divisors (2360025).

228912919 is an equidigital number, since it uses as much as digits as its factorization.

228912919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2360024.

The product of its digits is 46656, while the sum is 43.

The square root of 228912919 is about 15129.8684396131. The cubic root of 228912919 is about 611.7257580218.

The spelling of 228912919 in words is "two hundred twenty-eight million, nine hundred twelve thousand, nine hundred nineteen".