8642423813 has 2 divisors, whose sum is σ = 8642423814. Its totient is φ = 8642423812.

The previous prime is 8642423761. The next prime is 8642423833. The reversal of 8642423813 is 3183242468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6438778564 + 2203645249 = 80242^2 + 46943^2 .

It is a cyclic number.

It is not a de Polignac number, because 8642423813 - 2⁶ = 8642423749 is a prime.

It is a super-3 number, since 3×8642423813³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8642423833) 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, 4321211906 + 4321211907.

It is an arithmetic number, because the mean of its divisors is an integer number (4321211907).

Almost surely, 2^8642423813 is an apocalyptic number.

It is an amenable number.

8642423813 is a deficient number, since it is larger than the sum of its proper divisors (1).

8642423813 is an equidigital number, since it uses as much as digits as its factorization.

8642423813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 221184, while the sum is 41.

The square root of 8642423813 is about 92964.6374327357. The cubic root of 8642423813 is about 2052.1630005684.

The spelling of 8642423813 in words is "eight billion, six hundred forty-two million, four hundred twenty-three thousand, eight hundred thirteen".