80919799 has 2 divisors, whose sum is σ = 80919800. Its totient is φ = 80919798.

The previous prime is 80919793. The next prime is 80919821. The reversal of 80919799 is 99791908.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80919799 - 2¹⁷ = 80788727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80919793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40459899 + 40459900.

It is an arithmetic number, because the mean of its divisors is an integer number (40459900).

Almost surely, 2^80919799 is an apocalyptic number.

80919799 is a deficient number, since it is larger than the sum of its proper divisors (1).

80919799 is an equidigital number, since it uses as much as digits as its factorization.

80919799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 52.

The square root of 80919799 is about 8995.5432854275. The cubic root of 80919799 is about 432.5320216415.

It can be divided in two parts, 80919 and 799, that added together give a palindrome (81718).

The spelling of 80919799 in words is "eighty million, nine hundred nineteen thousand, seven hundred ninety-nine".