85817143 has 4 divisors (see below), whose sum is σ = 85874728. Its totient is φ = 85759560.

The previous prime is 85817131. The next prime is 85817191. The reversal of 85817143 is 34171858.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85817143 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 (85817113) 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 3 ways as a sum of consecutive naturals, for example, 26496 + ... + 29557.

It is an arithmetic number, because the mean of its divisors is an integer number (21468682).

Almost surely, 2^85817143 is an apocalyptic number.

85817143 is a deficient number, since it is larger than the sum of its proper divisors (57585).

85817143 is a wasteful number, since it uses less digits than its factorization.

85817143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57584.

The product of its digits is 26880, while the sum is 37.

The square root of 85817143 is about 9263.7542605576. The cubic root of 85817143 is about 441.0874325097.

The spelling of 85817143 in words is "eighty-five million, eight hundred seventeen thousand, one hundred forty-three".