85810187 has 4 divisors (see below), whose sum is σ = 86086416. Its totient is φ = 85533960.

The previous prime is 85810181. The next prime is 85810199. The reversal of 85810187 is 78101858.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78101858 = 2 ⋅39050929.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85810187 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85810187.

It is not an unprimeable number, because it can be changed into a prime (85810181) 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 in 3 ways as a sum of consecutive naturals, for example, 137648 + ... + 138269.

It is an arithmetic number, because the mean of its divisors is an integer number (21521604).

Almost surely, 2^85810187 is an apocalyptic number.

85810187 is a deficient number, since it is larger than the sum of its proper divisors (276229).

85810187 is a wasteful number, since it uses less digits than its factorization.

85810187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276228.

The product of its (nonzero) digits is 17920, while the sum is 38.

The square root of 85810187 is about 9263.3788112114. The cubic root of 85810187 is about 441.0755145836.

The spelling of 85810187 in words is "eighty-five million, eight hundred ten thousand, one hundred eighty-seven".