26564521 has 2 divisors, whose sum is σ = 26564522. Its totient is φ = 26564520.

The previous prime is 26564519. The next prime is 26564537. The reversal of 26564521 is 12546562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17347225 + 9217296 = 4165^2 + 3036^2 .

It is a cyclic number.

It is not a de Polignac number, because 26564521 - 2¹ = 26564519 is a prime.

Together with 26564519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (26564581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13282260 + 13282261.

It is an arithmetic number, because the mean of its divisors is an integer number (13282261).

Almost surely, 2^26564521 is an apocalyptic number.

It is an amenable number.

26564521 is a deficient number, since it is larger than the sum of its proper divisors (1).

26564521 is an equidigital number, since it uses as much as digits as its factorization.

26564521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 31.

The square root of 26564521 is about 5154.0780940921. The cubic root of 26564521 is about 298.3783649414.

The spelling of 26564521 in words is "twenty-six million, five hundred sixty-four thousand, five hundred twenty-one".