228181161 has 16 divisors (see below), whose sum is σ = 329302400. Its totient is φ = 139708800.

The previous prime is 228181159. The next prime is 228181169. The reversal of 228181161 is 161181822.

It is a happy number.

228181161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 228181161 - 2¹ = 228181159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228181169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6940 + ... + 22461.

It is an arithmetic number, because the mean of its divisors is an integer number (20581400).

Almost surely, 2^228181161 is an apocalyptic number.

It is an amenable number.

228181161 is a deficient number, since it is larger than the sum of its proper divisors (101121239).

228181161 is a wasteful number, since it uses less digits than its factorization.

228181161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29616.

The product of its digits is 1536, while the sum is 30.

The square root of 228181161 is about 15105.6665195548. Note that the first 3 decimals coincide. The cubic root of 228181161 is about 611.0732347128.

The spelling of 228181161 in words is "two hundred twenty-eight million, one hundred eighty-one thousand, one hundred sixty-one".