85191599 has 2 divisors, whose sum is σ = 85191600. Its totient is φ = 85191598.

The previous prime is 85191583. The next prime is 85191653. The reversal of 85191599 is 99519158.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85191599 - 2⁴ = 85191583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85191559) 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, 42595799 + 42595800.

It is an arithmetic number, because the mean of its divisors is an integer number (42595800).

Almost surely, 2^85191599 is an apocalyptic number.

85191599 is a deficient number, since it is larger than the sum of its proper divisors (1).

85191599 is an equidigital number, since it uses as much as digits as its factorization.

85191599 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 47.

The square root of 85191599 is about 9229.9295230245. The cubic root of 85191599 is about 440.0130832887.

The spelling of 85191599 in words is "eighty-five million, one hundred ninety-one thousand, five hundred ninety-nine".