26431 has 2 divisors, whose sum is σ = 26432. Its totient is φ = 26430.

The previous prime is 26423. The next prime is 26437. The reversal of 26431 is 13462.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26431 - 2³ = 26423 is a prime.

It is a super-2 number, since 2×26431² = 1397195522, which contains 22 as substring.

26431 is a lucky number.

It is a plaindrome in base 12.

It is a nialpdrome in base 6.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13215 + 13216.

It is an arithmetic number, because the mean of its divisors is an integer number (13216).

2²⁶⁴³¹ is an apocalyptic number.

26431 is a deficient number, since it is larger than the sum of its proper divisors (1).

26431 is an equidigital number, since it uses as much as digits as its factorization.

26431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 16.

The square root of 26431 is about 162.5761360102. The cubic root of 26431 is about 29.7877612911.

Adding to 26431 its reverse (13462), we get a palindrome (39893).

The spelling of 26431 in words is "twenty-six thousand, four hundred thirty-one".