84081799 has 2 divisors, whose sum is σ = 84081800. Its totient is φ = 84081798.

The previous prime is 84081791. The next prime is 84081839. The reversal of 84081799 is 99718048.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84081799 - 2³ = 84081791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84081791) 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, 42040899 + 42040900.

It is an arithmetic number, because the mean of its divisors is an integer number (42040900).

Almost surely, 2^84081799 is an apocalyptic number.

84081799 is a deficient number, since it is larger than the sum of its proper divisors (1).

84081799 is an equidigital number, since it uses as much as digits as its factorization.

84081799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 84081799 is about 9169.6128053479. The cubic root of 84081799 is about 438.0940267128.

The spelling of 84081799 in words is "eighty-four million, eighty-one thousand, seven hundred ninety-nine".