791638843 has 2 divisors, whose sum is σ = 791638844. Its totient is φ = 791638842.

The previous prime is 791638823. The next prime is 791638867. The reversal of 791638843 is 348836197.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (348836197) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-791638843 is a prime.

It is not a weakly prime, because it can be changed into another prime (791638823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 395819421 + 395819422.

It is an arithmetic number, because the mean of its divisors is an integer number (395819422).

Almost surely, 2^791638843 is an apocalyptic number.

791638843 is a deficient number, since it is larger than the sum of its proper divisors (1).

791638843 is an equidigital number, since it uses as much as digits as its factorization.

791638843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 49.

The square root of 791638843 is about 28136.0772496807. The cubic root of 791638843 is about 925.0723461311.

The spelling of 791638843 in words is "seven hundred ninety-one million, six hundred thirty-eight thousand, eight hundred forty-three".