8243813 has 2 divisors, whose sum is σ = 8243814. Its totient is φ = 8243812.

The previous prime is 8243791. The next prime is 8243819. The reversal of 8243813 is 3183428.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5987809 + 2256004 = 2447^2 + 1502^2 .

It is a cyclic number.

It is not a de Polignac number, because 8243813 - 2⁶ = 8243749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8243819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4121906 + 4121907.

It is an arithmetic number, because the mean of its divisors is an integer number (4121907).

Almost surely, 2^8243813 is an apocalyptic number.

It is an amenable number.

8243813 is a deficient number, since it is larger than the sum of its proper divisors (1).

8243813 is an equidigital number, since it uses as much as digits as its factorization.

8243813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 29.

The square root of 8243813 is about 2871.2041028112. The cubic root of 8243813 is about 202.0114769808.

The spelling of 8243813 in words is "eight million, two hundred forty-three thousand, eight hundred thirteen".