100811 has 2 divisors, whose sum is σ = 100812. Its totient is φ = 100810.

The previous prime is 100801. The next prime is 100823. The reversal of 100811 is 118001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 100811 - 2⁶ = 100747 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 100792 and 100801.

It is not a weakly prime, because it can be changed into another prime (100801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50405 + 50406.

It is an arithmetic number, because the mean of its divisors is an integer number (50406).

2¹⁰⁰⁸¹¹ is an apocalyptic number.

100811 is a deficient number, since it is larger than the sum of its proper divisors (1).

100811 is an equidigital number, since it uses as much as digits as its factorization.

100811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 100811 is about 317.5074802268. The cubic root of 100811 is about 46.5410282665.

Adding to 100811 its reverse (118001), we get a palindrome (218812).

The spelling of 100811 in words is "one hundred thousand, eight hundred eleven".