228165919 has 2 divisors, whose sum is σ = 228165920. Its totient is φ = 228165918.

The previous prime is 228165907. The next prime is 228165923. The reversal of 228165919 is 919561822.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 228165919 - 2⁹ = 228165407 is a prime.

It is a super-2 number, since 2×228165919² = 104119373186229122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228165979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114082959 + 114082960.

It is an arithmetic number, because the mean of its divisors is an integer number (114082960).

Almost surely, 2^228165919 is an apocalyptic number.

228165919 is a deficient number, since it is larger than the sum of its proper divisors (1).

228165919 is an equidigital number, since it uses as much as digits as its factorization.

228165919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 43.

The square root of 228165919 is about 15105.1619984693. The cubic root of 228165919 is about 611.0596282935.

The spelling of 228165919 in words is "two hundred twenty-eight million, one hundred sixty-five thousand, nine hundred nineteen".