16228813 has 2 divisors, whose sum is σ = 16228814. Its totient is φ = 16228812.

The previous prime is 16228801. The next prime is 16228819. The reversal of 16228813 is 31882261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12981609 + 3247204 = 3603^2 + 1802^2 .

It is an emirp because it is prime and its reverse (31882261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16228813 - 2¹³ = 16220621 is a prime.

It is the 4029-th Hogben number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16228819) by changing a digit.

It is a nontrivial repunit in base 4028.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8114406 + 8114407.

It is an arithmetic number, because the mean of its divisors is an integer number (8114407).

Almost surely, 2^16228813 is an apocalyptic number.

It is an amenable number.

16228813 is a deficient number, since it is larger than the sum of its proper divisors (1).

16228813 is an equidigital number, since it uses as much as digits as its factorization.

16228813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 31.

The square root of 16228813 is about 4028.5000930868. The cubic root of 16228813 is about 253.1797220104.

The spelling of 16228813 in words is "sixteen million, two hundred twenty-eight thousand, eight hundred thirteen".