80931859 has 4 divisors (see below), whose sum is σ = 80951704. Its totient is φ = 80912016.

The previous prime is 80931803. The next prime is 80931863. The reversal of 80931859 is 95813908.

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 80931859 - 2¹¹ = 80929811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80931869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1317 + ... + 12790.

It is an arithmetic number, because the mean of its divisors is an integer number (20237926).

Almost surely, 2^80931859 is an apocalyptic number.

80931859 is a deficient number, since it is larger than the sum of its proper divisors (19845).

80931859 is a wasteful number, since it uses less digits than its factorization.

80931859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19844.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 80931859 is about 8996.2135923954. The cubic root of 80931859 is about 432.5535082539.

The spelling of 80931859 in words is "eighty million, nine hundred thirty-one thousand, eight hundred fifty-nine".