26831 has 4 divisors (see below), whose sum is σ = 30672. Its totient is φ = 22992.

The previous prime is 26821. The next prime is 26833. The reversal of 26831 is 13862.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26831 is a prime.

It is a super-2 number, since 2×26831² = 1439805122, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1910 + ... + 1923.

It is an arithmetic number, because the mean of its divisors is an integer number (7668).

2²⁶⁸³¹ is an apocalyptic number.

26831 is a deficient number, since it is larger than the sum of its proper divisors (3841).

26831 is an equidigital number, since it uses as much as digits as its factorization.

26831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3840.

The product of its digits is 288, while the sum is 20.

The square root of 26831 is about 163.8017093928. The cubic root of 26831 is about 29.9372763570.

The spelling of 26831 in words is "twenty-six thousand, eight hundred thirty-one".