80801999 has 4 divisors (see below), whose sum is σ = 80901240. Its totient is φ = 80702760.

The previous prime is 80801989. The next prime is 80802017. The reversal of 80801999 is 99910808.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80801999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80801989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48389 + ... + 50030.

It is an arithmetic number, because the mean of its divisors is an integer number (20225310).

Almost surely, 2^80801999 is an apocalyptic number.

80801999 is a deficient number, since it is larger than the sum of its proper divisors (99241).

80801999 is an equidigital number, since it uses as much as digits as its factorization.

80801999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99240.

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 80801999 is about 8988.9932139256. The cubic root of 80801999 is about 432.3220317602.

The spelling of 80801999 in words is "eighty million, eight hundred one thousand, nine hundred ninety-nine".