8644791949 has 2 divisors, whose sum is σ = 8644791950. Its totient is φ = 8644791948.

The previous prime is 8644791919. The next prime is 8644791977. The reversal of 8644791949 is 9491974468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8373531049 + 271260900 = 91507^2 + 16470^2 .

It is a cyclic number.

It is not a de Polignac number, because 8644791949 - 2²³ = 8636403341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8644791919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4322395974 + 4322395975.

It is an arithmetic number, because the mean of its divisors is an integer number (4322395975).

Almost surely, 2^8644791949 is an apocalyptic number.

It is an amenable number.

8644791949 is a deficient number, since it is larger than the sum of its proper divisors (1).

8644791949 is an equidigital number, since it uses as much as digits as its factorization.

8644791949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15676416, while the sum is 61.

The square root of 8644791949 is about 92977.3733173830. The cubic root of 8644791949 is about 2052.3504231931.

The spelling of 8644791949 in words is "eight billion, six hundred forty-four million, seven hundred ninety-one thousand, nine hundred forty-nine".