26531 has 4 divisors (see below), whose sum is σ = 27192.
Its totient is φ = 25872.
The previous prime is 26513. The next prime is 26539. The reversal of 26531 is 13562.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13562 = 2 ⋅6781.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-26531 is a prime.
It is a super-2 number, since 2×265312 = 1407787922, which contains 22 as substring.
It is a Duffinian number.
It is a nialpdrome in base 14.
It is not an unprimeable number, because it can be changed into a prime (26539) 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, 266 + ... + 351.
It is an arithmetic number, because the mean of its divisors is an integer number (6798).
226531 is an apocalyptic number.
26531 is a deficient number, since it is larger than the sum of its proper divisors (661).
26531 is an equidigital number, since it uses as much as digits as its factorization.
26531 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 660.
The product of its digits is 180, while the sum is 17.
The square root of 26531 is about 162.8833938743.
The cubic root of 26531 is about 29.8252807107.
The spelling of 26531 in words is "twenty-six thousand, five hundred thirty-one".