131811 has 8 divisors (see below), whose sum is σ = 179280. Its totient is φ = 86112.

The previous prime is 131797. The next prime is 131837. The reversal of 131811 is 118131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131811 - 2⁵ = 131779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256 + ... + 573.

It is an arithmetic number, because the mean of its divisors is an integer number (22410).

2¹³¹⁸¹¹ is an apocalyptic number.

131811 is a deficient number, since it is larger than the sum of its proper divisors (47469).

131811 is an equidigital number, since it uses as much as digits as its factorization.

131811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885.

The product of its digits is 24, while the sum is 15.

The square root of 131811 is about 363.0578466305. The cubic root of 131811 is about 50.8921210640.

Adding to 131811 its reverse (118131), we get a palindrome (249942).

The spelling of 131811 in words is "one hundred thirty-one thousand, eight hundred eleven".