80811 has 16 divisors (see below), whose sum is σ = 124320. Its totient is φ = 51840.

The previous prime is 80809. The next prime is 80819. The reversal of 80811 is 11808.

It is a happy number.

It is not a de Polignac number, because 80811 - 2¹ = 80809 is a prime.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

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 15 ways as a sum of consecutive naturals, for example, 1071 + ... + 1143.

It is an arithmetic number, because the mean of its divisors is an integer number (7770).

2⁸⁰⁸¹¹ is an apocalyptic number.

80811 is a deficient number, since it is larger than the sum of its proper divisors (43509).

80811 is a wasteful number, since it uses less digits than its factorization.

80811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 80811 is about 284.2727563450. The cubic root of 80811 is about 43.2338084111.

It can be divided in two parts, 808 and 11, that multiplied together give a palindrome (8888).

The spelling of 80811 in words is "eighty thousand, eight hundred eleven".