85771129 has 4 divisors (see below), whose sum is σ = 85789684. Its totient is φ = 85752576.

The previous prime is 85771097. The next prime is 85771157. The reversal of 85771129 is 92117758.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 92117758 = 2 ⋅46058879.

It can be written as a sum of positive squares in 2 ways, for example, as 66455104 + 19316025 = 8152^2 + 4395^2 .

It is a cyclic number.

It is not a de Polignac number, because 85771129 - 2⁵ = 85771097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85771091 and 85771100.

It is not an unprimeable number, because it can be changed into a prime (85771159) 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, 3829 + ... + 13645.

It is an arithmetic number, because the mean of its divisors is an integer number (21447421).

Almost surely, 2^85771129 is an apocalyptic number.

It is an amenable number.

85771129 is a deficient number, since it is larger than the sum of its proper divisors (18555).

85771129 is an equidigital number, since it uses as much as digits as its factorization.

85771129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18554.

The product of its digits is 35280, while the sum is 40.

The square root of 85771129 is about 9261.2703772215. The cubic root of 85771129 is about 441.0085833621.

The spelling of 85771129 in words is "eighty-five million, seven hundred seventy-one thousand, one hundred twenty-nine".