228694813 has 2 divisors, whose sum is σ = 228694814. Its totient is φ = 228694812.

The previous prime is 228694799. The next prime is 228694831. The reversal of 228694813 is 318496822.

Together with next prime (228694831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221950404 + 6744409 = 14898^2 + 2597^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228694813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 228694813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228694853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114347406 + 114347407.

It is an arithmetic number, because the mean of its divisors is an integer number (114347407).

Almost surely, 2^228694813 is an apocalyptic number.

It is an amenable number.

228694813 is a deficient number, since it is larger than the sum of its proper divisors (1).

228694813 is an equidigital number, since it uses as much as digits as its factorization.

228694813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 43.

The square root of 228694813 is about 15122.6589262603. The cubic root of 228694813 is about 611.5314141707.

The spelling of 228694813 in words is "two hundred twenty-eight million, six hundred ninety-four thousand, eight hundred thirteen".