85531471771 has 4 divisors (see below), whose sum is σ = 90033128200. Its totient is φ = 81029815344.

The previous prime is 85531471769. The next prime is 85531471843. The reversal of 85531471771 is 17717413558.

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 85531471771 - 2¹ = 85531471769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85531471721) 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, 2250828186 + ... + 2250828223.

It is an arithmetic number, because the mean of its divisors is an integer number (22508282050).

Almost surely, 2^85531471771 is an apocalyptic number.

85531471771 is a deficient number, since it is larger than the sum of its proper divisors (4501656429).

85531471771 is a wasteful number, since it uses less digits than its factorization.

85531471771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4501656428.

The product of its digits is 823200, while the sum is 49.

The spelling of 85531471771 in words is "eighty-five billion, five hundred thirty-one million, four hundred seventy-one thousand, seven hundred seventy-one".