85001999 has 2 divisors, whose sum is σ = 85002000. Its totient is φ = 85001998.

The previous prime is 85001963. The next prime is 85002007. The reversal of 85001999 is 99910058.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85001999 - 2⁸ = 85001743 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85001899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42500999 + 42501000.

It is an arithmetic number, because the mean of its divisors is an integer number (42501000).

Almost surely, 2^85001999 is an apocalyptic number.

85001999 is a deficient number, since it is larger than the sum of its proper divisors (1).

85001999 is an equidigital number, since it uses as much as digits as its factorization.

85001999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 41.

The square root of 85001999 is about 9219.6528676518. The cubic root of 85001999 is about 439.6864139584.

The spelling of 85001999 in words is "eighty-five million, one thousand, nine hundred ninety-nine".