85991543 has 8 divisors (see below), whose sum is σ = 94058496. Its totient is φ = 77966200.

The previous prime is 85991537. The next prime is 85991557. The reversal of 85991543 is 34519958.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85991543 - 2¹⁴ = 85975159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85991494 and 85991503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85991743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5993 + ... + 14418.

It is an arithmetic number, because the mean of its divisors is an integer number (11757312).

Almost surely, 2^85991543 is an apocalyptic number.

85991543 is a deficient number, since it is larger than the sum of its proper divisors (8066953).

85991543 is a wasteful number, since it uses less digits than its factorization.

85991543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20805.

The product of its digits is 194400, while the sum is 44.

The square root of 85991543 is about 9273.1625134039. The cubic root of 85991543 is about 441.3860270723.

It can be divided in two parts, 859915 and 43, that added together give a palindrome (859958).

The spelling of 85991543 in words is "eighty-five million, nine hundred ninety-one thousand, five hundred forty-three".