85511839 has 8 divisors (see below), whose sum is σ = 98082848. Its totient is φ = 73029600.

The previous prime is 85511809. The next prime is 85511851. The reversal of 85511839 is 93811558.

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

It is not a de Polignac number, because 85511839 - 2⁷ = 85511711 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 (85511809) 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, 20112 + ... + 23989.

It is an arithmetic number, because the mean of its divisors is an integer number (12260356).

Almost surely, 2^85511839 is an apocalyptic number.

85511839 is a deficient number, since it is larger than the sum of its proper divisors (12571009).

85511839 is a wasteful number, since it uses less digits than its factorization.

85511839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44385.

The product of its digits is 43200, while the sum is 40.

The square root of 85511839 is about 9247.2611620955. The cubic root of 85511839 is about 440.5637385045.

The spelling of 85511839 in words is "eighty-five million, five hundred eleven thousand, eight hundred thirty-nine".