85821143 has 4 divisors (see below), whose sum is σ = 86007768. Its totient is φ = 85634520.

The previous prime is 85821137. The next prime is 85821149. The reversal of 85821143 is 34112858.

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

It is an interprime number because it is at equal distance from previous prime (85821137) and next prime (85821149).

It is a cyclic number.

It is not a de Polignac number, because 85821143 - 2⁶ = 85821079 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 (85821149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92621 + ... + 93542.

It is an arithmetic number, because the mean of its divisors is an integer number (21501942).

Almost surely, 2^85821143 is an apocalyptic number.

85821143 is a deficient number, since it is larger than the sum of its proper divisors (186625).

85821143 is a wasteful number, since it uses less digits than its factorization.

85821143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186624.

The product of its digits is 7680, while the sum is 32.

The square root of 85821143 is about 9263.9701532334. The cubic root of 85821143 is about 441.0942855395.

The spelling of 85821143 in words is "eighty-five million, eight hundred twenty-one thousand, one hundred forty-three".