791621899 has 2 divisors, whose sum is σ = 791621900. Its totient is φ = 791621898.

The previous prime is 791621869. The next prime is 791622011. The reversal of 791621899 is 998126197.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 791621899 - 2¹⁷ = 791490827 is a prime.

It is not a weakly prime, because it can be changed into another prime (791621849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 395810949 + 395810950.

It is an arithmetic number, because the mean of its divisors is an integer number (395810950).

Almost surely, 2^791621899 is an apocalyptic number.

791621899 is a deficient number, since it is larger than the sum of its proper divisors (1).

791621899 is an equidigital number, since it uses as much as digits as its factorization.

791621899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 52.

The square root of 791621899 is about 28135.7761399966. The cubic root of 791621899 is about 925.0657460938.

The spelling of 791621899 in words is "seven hundred ninety-one million, six hundred twenty-one thousand, eight hundred ninety-nine".