26555591 has 2 divisors, whose sum is σ = 26555592. Its totient is φ = 26555590.

The previous prime is 26555587. The next prime is 26555609. The reversal of 26555591 is 19555562.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26555591 - 2² = 26555587 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26555531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13277795 + 13277796.

It is an arithmetic number, because the mean of its divisors is an integer number (13277796).

Almost surely, 2^26555591 is an apocalyptic number.

26555591 is a deficient number, since it is larger than the sum of its proper divisors (1).

26555591 is an equidigital number, since it uses as much as digits as its factorization.

26555591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 67500, while the sum is 38.

The square root of 26555591 is about 5153.2117169781. The cubic root of 26555591 is about 298.3449266394.

The spelling of 26555591 in words is "twenty-six million, five hundred fifty-five thousand, five hundred ninety-one".