126811 has 4 divisors (see below), whose sum is σ = 127624. Its totient is φ = 126000.

The previous prime is 126781. The next prime is 126823. The reversal of 126811 is 118621.

It is a semiprime because it is the product of two primes, 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 126811 - 2⁷ = 126683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90 + ... + 511.

It is an arithmetic number, because the mean of its divisors is an integer number (31906).

2¹²⁶⁸¹¹ is an apocalyptic number.

126811 is a deficient number, since it is larger than the sum of its proper divisors (813).

126811 is an equidigital number, since it uses as much as digits as its factorization.

126811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812.

The product of its digits is 96, while the sum is 19.

The square root of 126811 is about 356.1053214991. The cubic root of 126811 is about 50.2403098399.

The spelling of 126811 in words is "one hundred twenty-six thousand, eight hundred eleven".