85131847 has 4 divisors (see below), whose sum is σ = 85152456. Its totient is φ = 85111240.

The previous prime is 85131841. The next prime is 85131881. The reversal of 85131847 is 74813158.

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 85131847 - 2⁷ = 85131719 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 (85131841) 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, 1729 + ... + 13162.

It is an arithmetic number, because the mean of its divisors is an integer number (21288114).

Almost surely, 2^85131847 is an apocalyptic number.

85131847 is a deficient number, since it is larger than the sum of its proper divisors (20609).

85131847 is a wasteful number, since it uses less digits than its factorization.

85131847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20608.

The product of its digits is 26880, while the sum is 37.

The square root of 85131847 is about 9226.6920941364. The cubic root of 85131847 is about 439.9101865582.

The spelling of 85131847 in words is "eighty-five million, one hundred thirty-one thousand, eight hundred forty-seven".