8423931809 has 2 divisors, whose sum is σ = 8423931810. Its totient is φ = 8423931808.

The previous prime is 8423931787. The next prime is 8423931829. The reversal of 8423931809 is 9081393248.

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., 7336779025 + 1087152784 = 85655^2 + 32972^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8423931809 is a prime.

It is not a weakly prime, because it can be changed into another prime (8423931829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4211965904 + 4211965905.

It is an arithmetic number, because the mean of its divisors is an integer number (4211965905).

Almost surely, 2^8423931809 is an apocalyptic number.

It is an amenable number.

8423931809 is a deficient number, since it is larger than the sum of its proper divisors (1).

8423931809 is an equidigital number, since it uses as much as digits as its factorization.

8423931809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 8423931809 is about 91781.9797618247. The cubic root of 8423931809 is about 2034.7213755254.

The spelling of 8423931809 in words is "eight billion, four hundred twenty-three million, nine hundred thirty-one thousand, eight hundred nine".