11831 has 2 divisors, whose sum is σ = 11832. Its totient is φ = 11830.
The previous prime is 11827. The next prime is 11833. The reversal of 11831 is 13811.
11831 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 11831 - 22 = 11827 is a prime.
It is a super-2 number, since 2×118312 = 279945122, which contains 22 as substring.
It is a Sophie Germain prime.
Together with 11833, it forms a pair of twin primes.
It is a Chen prime.
It is a plaindrome in base 15.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (11833) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5915 + 5916.
It is an arithmetic number, because the mean of its divisors is an integer number (5916).
211831 is an apocalyptic number.
11831 is a deficient number, since it is larger than the sum of its proper divisors (1).
11831 is an equidigital number, since it uses as much as digits as its factorization.
11831 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 24, while the sum is 14.
The square root of 11831 is about 108.7704003854. The cubic root of 11831 is about 22.7863003779.
The spelling of 11831 in words is "eleven thousand, eight hundred thirty-one".
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