8239166491 has 2 divisors, whose sum is σ = 8239166492. Its totient is φ = 8239166490.

The previous prime is 8239166473. The next prime is 8239166519. The reversal of 8239166491 is 1946619328.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8239166491 - 2⁵ = 8239166459 is a prime.

It is not a weakly prime, because it can be changed into another prime (8239166461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4119583245 + 4119583246.

It is an arithmetic number, because the mean of its divisors is an integer number (4119583246).

Almost surely, 2^8239166491 is an apocalyptic number.

8239166491 is a deficient number, since it is larger than the sum of its proper divisors (1).

8239166491 is an equidigital number, since it uses as much as digits as its factorization.

8239166491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 49.

The square root of 8239166491 is about 90769.8545278112. The cubic root of 8239166491 is about 2019.7351620736.

The spelling of 8239166491 in words is "eight billion, two hundred thirty-nine million, one hundred sixty-six thousand, four hundred ninety-one".