85018591 has 4 divisors (see below), whose sum is σ = 97164112. Its totient is φ = 72873072.

The previous prime is 85018589. The next prime is 85018613. The reversal of 85018591 is 19581058.

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

It is a cyclic number.

It is not a de Polignac number, because 85018591 - 2¹ = 85018589 is a prime.

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 85018591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85018541) 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, 6072750 + ... + 6072763.

It is an arithmetic number, because the mean of its divisors is an integer number (24291028).

Almost surely, 2^85018591 is an apocalyptic number.

85018591 is a deficient number, since it is larger than the sum of its proper divisors (12145521).

85018591 is a wasteful number, since it uses less digits than its factorization.

85018591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12145520.

The product of its (nonzero) digits is 14400, while the sum is 37.

The square root of 85018591 is about 9220.5526407044. The cubic root of 85018591 is about 439.7150203537.

The spelling of 85018591 in words is "eighty-five million, eighteen thousand, five hundred ninety-one".