228642233 has 2 divisors, whose sum is σ = 228642234. Its totient is φ = 228642232.

The previous prime is 228642229. The next prime is 228642259. The reversal of 228642233 is 332246822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 224610169 + 4032064 = 14987^2 + 2008^2 .

It is a cyclic number.

It is not a de Polignac number, because 228642233 - 2² = 228642229 is a prime.

It is a super-2 number, since 2×228642233² = 104554541422452578, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 228642233.

It is not a weakly prime, because it can be changed into another prime (228642133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114321116 + 114321117.

It is an arithmetic number, because the mean of its divisors is an integer number (114321117).

Almost surely, 2^228642233 is an apocalyptic number.

It is an amenable number.

228642233 is a deficient number, since it is larger than the sum of its proper divisors (1).

228642233 is an equidigital number, since it uses as much as digits as its factorization.

228642233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 32.

The square root of 228642233 is about 15120.9203754269. The cubic root of 228642233 is about 611.4845441581.

The spelling of 228642233 in words is "two hundred twenty-eight million, six hundred forty-two thousand, two hundred thirty-three".