80813 has 4 divisors (see below), whose sum is σ = 81408. Its totient is φ = 80220.

The previous prime is 80809. The next prime is 80819. The reversal of 80813 is 31808.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 80813 - 2² = 80809 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80819) 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, 20 + ... + 402.

It is an arithmetic number, because the mean of its divisors is an integer number (20352).

2⁸⁰⁸¹³ is an apocalyptic number.

It is an amenable number.

80813 is a deficient number, since it is larger than the sum of its proper divisors (595).

80813 is a wasteful number, since it uses less digits than its factorization.

80813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 80813 is about 284.2762740715. The cubic root of 80813 is about 43.2341650742.

The spelling of 80813 in words is "eighty thousand, eight hundred thirteen".