228991613 has 2 divisors, whose sum is σ = 228991614. Its totient is φ = 228991612.

The previous prime is 228991597. The next prime is 228991639. The reversal of 228991613 is 316199822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174187204 + 54804409 = 13198^2 + 7403^2 .

It is a cyclic number.

It is not a de Polignac number, because 228991613 - 2⁴ = 228991597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228991643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114495806 + 114495807.

It is an arithmetic number, because the mean of its divisors is an integer number (114495807).

Almost surely, 2^228991613 is an apocalyptic number.

It is an amenable number.

228991613 is a deficient number, since it is larger than the sum of its proper divisors (1).

228991613 is an equidigital number, since it uses as much as digits as its factorization.

228991613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 41.

The square root of 228991613 is about 15132.4688336041. The cubic root of 228991613 is about 611.7958481850.

The spelling of 228991613 in words is "two hundred twenty-eight million, nine hundred ninety-one thousand, six hundred thirteen".