85187999 has 12 divisors (see below), whose sum is σ = 92530656. Its totient is φ = 78391872.

The previous prime is 85187989. The next prime is 85188011. The reversal of 85187999 is 99978158.

It is a happy number.

It is not a de Polignac number, because 85187999 - 2¹⁶ = 85122463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85187939) 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 in 11 ways as a sum of consecutive naturals, for example, 76682 + ... + 77784.

It is an arithmetic number, because the mean of its divisors is an integer number (7710888).

Almost surely, 2^85187999 is an apocalyptic number.

85187999 is a deficient number, since it is larger than the sum of its proper divisors (7342657).

85187999 is a wasteful number, since it uses less digits than its factorization.

85187999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1586 (or 1573 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 56.

The square root of 85187999 is about 9229.7345032238. The cubic root of 85187999 is about 440.0068852228.

The spelling of 85187999 in words is "eighty-five million, one hundred eighty-seven thousand, nine hundred ninety-nine".