26986591 has 4 divisors (see below), whose sum is σ = 26997912. Its totient is φ = 26975272.

The previous prime is 26986571. The next prime is 26986621. The reversal of 26986591 is 19568962.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 26986591 - 2¹⁷ = 26855519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26986571) 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, 541 + ... + 7366.

It is an arithmetic number, because the mean of its divisors is an integer number (6749478).

Almost surely, 2^26986591 is an apocalyptic number.

26986591 is a deficient number, since it is larger than the sum of its proper divisors (11321).

26986591 is an equidigital number, since it uses as much as digits as its factorization.

26986591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11320.

The product of its digits is 233280, while the sum is 46.

The square root of 26986591 is about 5194.8619808422. The cubic root of 26986591 is about 299.9503288134.

The spelling of 26986591 in words is "twenty-six million, nine hundred eighty-six thousand, five hundred ninety-one".