85131571 has 16 divisors (see below), whose sum is σ = 104512000. Its totient is φ = 69124104.

The previous prime is 85131569. The next prime is 85131581. The reversal of 85131571 is 17513158.

It is not a de Polignac number, because 85131571 - 2¹ = 85131569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85131511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15 + ... + 13048.

It is an arithmetic number, because the mean of its divisors is an integer number (6532000).

Almost surely, 2^85131571 is an apocalyptic number.

85131571 is a deficient number, since it is larger than the sum of its proper divisors (19380429).

85131571 is a wasteful number, since it uses less digits than its factorization.

85131571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13103 (or 13089 counting only the distinct ones).

The product of its digits is 4200, while the sum is 31.

The square root of 85131571 is about 9226.6771375181. The cubic root of 85131571 is about 439.9097111570.

It can be divided in two parts, 8513157 and 1, that added together give a palindrome (8513158).

The spelling of 85131571 in words is "eighty-five million, one hundred thirty-one thousand, five hundred seventy-one".