85384771491 has 4 divisors (see below), whose sum is σ = 113846361992. Its totient is φ = 56923180992.

The previous prime is 85384771481. The next prime is 85384771529. The reversal of 85384771491 is 19417748358.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 85384771491 - 2⁷ = 85384771363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85384771471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14230795246 + ... + 14230795251.

It is an arithmetic number, because the mean of its divisors is an integer number (28461590498).

Almost surely, 2^85384771491 is an apocalyptic number.

85384771491 is a deficient number, since it is larger than the sum of its proper divisors (28461590501).

85384771491 is a wasteful number, since it uses less digits than its factorization.

85384771491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28461590500.

The product of its digits is 6773760, while the sum is 57.

The spelling of 85384771491 in words is "eighty-five billion, three hundred eighty-four million, seven hundred seventy-one thousand, four hundred ninety-one".