228423161 has 4 divisors (see below), whose sum is σ = 232294800. Its totient is φ = 224551524.

The previous prime is 228423133. The next prime is 228423191. The reversal of 228423161 is 161324822.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 161324822 = 2 ⋅80662411.

It is a cyclic number.

It is not a de Polignac number, because 228423161 - 2¹⁰ = 228422137 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (228423131) 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 3 ways as a sum of consecutive naturals, for example, 1935731 + ... + 1935848.

It is an arithmetic number, because the mean of its divisors is an integer number (58073700).

Almost surely, 2^228423161 is an apocalyptic number.

It is an amenable number.

228423161 is a deficient number, since it is larger than the sum of its proper divisors (3871639).

228423161 is an equidigital number, since it uses as much as digits as its factorization.

228423161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3871638.

The product of its digits is 4608, while the sum is 29.

The square root of 228423161 is about 15113.6746359051. The cubic root of 228423161 is about 611.2891851656.

Adding to 228423161 its reverse (161324822), we get a palindrome (389747983).

The spelling of 228423161 in words is "two hundred twenty-eight million, four hundred twenty-three thousand, one hundred sixty-one".