80905859 has 4 divisors (see below), whose sum is σ = 81169704. Its totient is φ = 80642016.

The previous prime is 80905843. The next prime is 80905871. The reversal of 80905859 is 95850908.

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 80905859 - 2⁴ = 80905843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80905879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131462 + ... + 132075.

It is an arithmetic number, because the mean of its divisors is an integer number (20292426).

Almost surely, 2^80905859 is an apocalyptic number.

80905859 is a deficient number, since it is larger than the sum of its proper divisors (263845).

80905859 is a wasteful number, since it uses less digits than its factorization.

80905859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263844.

The product of its (nonzero) digits is 129600, while the sum is 44.

The square root of 80905859 is about 8994.7684239229. The cubic root of 80905859 is about 432.5071828805.

The spelling of 80905859 in words is "eighty million, nine hundred five thousand, eight hundred fifty-nine".