80999859 has 16 divisors (see below), whose sum is σ = 113186304. Its totient is φ = 51427200.

The previous prime is 80999857. The next prime is 80999881. The reversal of 80999859 is 95899908.

It is not a de Polignac number, because 80999859 - 2¹ = 80999857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 80999799 and 80999808.

It is not an unprimeable number, because it can be changed into a prime (80999857) 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, 14194 + ... + 19064.

It is an arithmetic number, because the mean of its divisors is an integer number (7074144).

Almost surely, 2^80999859 is an apocalyptic number.

80999859 is a deficient number, since it is larger than the sum of its proper divisors (32186445).

80999859 is a wasteful number, since it uses less digits than its factorization.

80999859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5138.

The product of its (nonzero) digits is 2099520, while the sum is 57.

The square root of 80999859 is about 8999.9921666633. The cubic root of 80999859 is about 432.6746200338.

The spelling of 80999859 in words is "eighty million, nine hundred ninety-nine thousand, eight hundred fifty-nine".