228320051 has 4 divisors (see below), whose sum is σ = 228956400. Its totient is φ = 227683704.

The previous prime is 228320039. The next prime is 228320077. The reversal of 228320051 is 150023822.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228320051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 228319999 and 228320026.

It is not an unprimeable number, because it can be changed into a prime (228320551) 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, 317636 + ... + 318353.

It is an arithmetic number, because the mean of its divisors is an integer number (57239100).

Almost surely, 2^228320051 is an apocalyptic number.

228320051 is a deficient number, since it is larger than the sum of its proper divisors (636349).

228320051 is an equidigital number, since it uses as much as digits as its factorization.

228320051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636348.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 228320051 is about 15110.2631016141. The cubic root of 228320051 is about 611.1971928680.

Adding to 228320051 its reverse (150023822), we get a palindrome (378343873).

The spelling of 228320051 in words is "two hundred twenty-eight million, three hundred twenty thousand, fifty-one".