26581231 has 4 divisors (see below), whose sum is σ = 26635000. Its totient is φ = 26527464.

The previous prime is 26581213. The next prime is 26581237. The reversal of 26581231 is 13218562.

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

It is a cyclic number.

It is not a de Polignac number, because 26581231 - 2¹⁷ = 26450159 is a prime.

It is a super-2 number, since 2×26581231² = 1413123682950722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26581231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26581237) 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, 26136 + ... + 27133.

It is an arithmetic number, because the mean of its divisors is an integer number (6658750).

Almost surely, 2^26581231 is an apocalyptic number.

26581231 is a deficient number, since it is larger than the sum of its proper divisors (53769).

26581231 is an equidigital number, since it uses as much as digits as its factorization.

26581231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53768.

The product of its digits is 2880, while the sum is 28.

The square root of 26581231 is about 5155.6988856992. The cubic root of 26581231 is about 298.4409152556.

Adding to 26581231 its reverse (13218562), we get a palindrome (39799793).

The spelling of 26581231 in words is "twenty-six million, five hundred eighty-one thousand, two hundred thirty-one".