228223137 has 4 divisors (see below), whose sum is σ = 304297520. Its totient is φ = 152148756.

The previous prime is 228223133. The next prime is 228223159. The reversal of 228223137 is 731322822.

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.

It is not a de Polignac number, because 228223137 - 2² = 228223133 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228223133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38037187 + ... + 38037192.

It is an arithmetic number, because the mean of its divisors is an integer number (76074380).

Almost surely, 2^228223137 is an apocalyptic number.

It is an amenable number.

228223137 is a deficient number, since it is larger than the sum of its proper divisors (76074383).

228223137 is an equidigital number, since it uses as much as digits as its factorization.

228223137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76074382.

The product of its digits is 8064, while the sum is 30.

The square root of 228223137 is about 15107.0558680373. The cubic root of 228223137 is about 611.1107032418.

Adding to 228223137 its reverse (731322822), we get a palindrome (959545959).

The spelling of 228223137 in words is "two hundred twenty-eight million, two hundred twenty-three thousand, one hundred thirty-seven".