228787213 has 2 divisors, whose sum is σ = 228787214. Its totient is φ = 228787212.

The previous prime is 228787201. The next prime is 228787261. The reversal of 228787213 is 312787822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 228553924 + 233289 = 15118^2 + 483^2 .

It is a cyclic number.

It is not a de Polignac number, because 228787213 - 2²⁵ = 195232781 is a prime.

It is equal to p_12579583 and since 228787213 and 12579583 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228787313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114393606 + 114393607.

It is an arithmetic number, because the mean of its divisors is an integer number (114393607).

Almost surely, 2^228787213 is an apocalyptic number.

It is an amenable number.

228787213 is a deficient number, since it is larger than the sum of its proper divisors (1).

228787213 is an equidigital number, since it uses as much as digits as its factorization.

228787213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75264, while the sum is 40.

The square root of 228787213 is about 15125.7136360570. The cubic root of 228787213 is about 611.6137624811.

The spelling of 228787213 in words is "two hundred twenty-eight million, seven hundred eighty-seven thousand, two hundred thirteen".