80571891 has 16 divisors (see below), whose sum is σ = 114200064. Its totient is φ = 50354304.

The previous prime is 80571871. The next prime is 80571893. The reversal of 80571891 is 19817508.

It is not a de Polignac number, because 80571891 - 2¹⁹ = 80047603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80571893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10410 + ... + 16416.

It is an arithmetic number, because the mean of its divisors is an integer number (7137504).

Almost surely, 2^80571891 is an apocalyptic number.

80571891 is a deficient number, since it is larger than the sum of its proper divisors (33628173).

80571891 is a wasteful number, since it uses less digits than its factorization.

80571891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6290.

The product of its (nonzero) digits is 20160, while the sum is 39.

The square root of 80571891 is about 8976.1846571915. The cubic root of 80571891 is about 431.9112525600.

The spelling of 80571891 in words is "eighty million, five hundred seventy-one thousand, eight hundred ninety-one".