85043591 has 4 divisors (see below), whose sum is σ = 85062552. Its totient is φ = 85024632.

The previous prime is 85043561. The next prime is 85043593. The reversal of 85043591 is 19534058.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19534058 = 2 ⋅9767029.

It is a cyclic number.

It is not a de Polignac number, because 85043591 - 2¹⁰ = 85042567 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 (85043593) 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, 1445 + ... + 13121.

It is an arithmetic number, because the mean of its divisors is an integer number (21265638).

Almost surely, 2^85043591 is an apocalyptic number.

85043591 is a deficient number, since it is larger than the sum of its proper divisors (18961).

85043591 is a wasteful number, since it uses less digits than its factorization.

85043591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18960.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 85043591 is about 9221.9082081747. The cubic root of 85043591 is about 439.7581160189.

The spelling of 85043591 in words is "eighty-five million, forty-three thousand, five hundred ninety-one".