26539391 has 2 divisors, whose sum is σ = 26539392. Its totient is φ = 26539390.

The previous prime is 26539367. The next prime is 26539393. The reversal of 26539391 is 19393562.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26539391 - 2⁶ = 26539327 is a prime.

Together with 26539393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26539393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13269695 + 13269696.

It is an arithmetic number, because the mean of its divisors is an integer number (13269696).

Almost surely, 2^26539391 is an apocalyptic number.

26539391 is a deficient number, since it is larger than the sum of its proper divisors (1).

26539391 is an equidigital number, since it uses as much as digits as its factorization.

26539391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43740, while the sum is 38.

The square root of 26539391 is about 5151.6396419004. The cubic root of 26539391 is about 298.2842467502.

The spelling of 26539391 in words is "twenty-six million, five hundred thirty-nine thousand, three hundred ninety-one".