228161111 has 4 divisors (see below), whose sum is σ = 229116000. Its totient is φ = 227206224.

The previous prime is 228161093. The next prime is 228161117. The reversal of 228161111 is 111161822.

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 228161111 - 2¹⁴ = 228144727 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 (228161117) 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, 477086 + ... + 477563.

It is an arithmetic number, because the mean of its divisors is an integer number (57279000).

Almost surely, 2^228161111 is an apocalyptic number.

228161111 is a deficient number, since it is larger than the sum of its proper divisors (954889).

228161111 is an equidigital number, since it uses as much as digits as its factorization.

228161111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954888.

The product of its digits is 192, while the sum is 23.

The square root of 228161111 is about 15105.0028467392. The cubic root of 228161111 is about 611.0553361022.

The spelling of 228161111 in words is "two hundred twenty-eight million, one hundred sixty-one thousand, one hundred eleven".