4085128171 has 4 divisors (see below), whose sum is σ = 4091198872. Its totient is φ = 4079057472.

The previous prime is 4085128147. The next prime is 4085128211. The reversal of 4085128171 is 1718215804.

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 4085128171 - 2²⁷ = 3950910443 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 4085128171.

It is not an unprimeable number, because it can be changed into a prime (4085128121) 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, 3034341 + ... + 3035686.

It is an arithmetic number, because the mean of its divisors is an integer number (1022799718).

Almost surely, 2^4085128171 is an apocalyptic number.

4085128171 is a deficient number, since it is larger than the sum of its proper divisors (6070701).

4085128171 is an equidigital number, since it uses as much as digits as its factorization.

4085128171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6070700.

The product of its (nonzero) digits is 17920, while the sum is 37.

The square root of 4085128171 is about 63915.0074004533. The cubic root of 4085128171 is about 1598.5831429586.

The spelling of 4085128171 in words is "four billion, eighty-five million, one hundred twenty-eight thousand, one hundred seventy-one".