26564491 has 2 divisors, whose sum is σ = 26564492. Its totient is φ = 26564490.

The previous prime is 26564467. The next prime is 26564507. The reversal of 26564491 is 19446562.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26564491 - 2⁵ = 26564459 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26564491.

It is not a weakly prime, because it can be changed into another prime (26564401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13282245 + 13282246.

It is an arithmetic number, because the mean of its divisors is an integer number (13282246).

Almost surely, 2^26564491 is an apocalyptic number.

26564491 is a deficient number, since it is larger than the sum of its proper divisors (1).

26564491 is an equidigital number, since it uses as much as digits as its factorization.

26564491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 37.

The square root of 26564491 is about 5154.0751837745. The cubic root of 26564491 is about 298.3782526192.

The spelling of 26564491 in words is "twenty-six million, five hundred sixty-four thousand, four hundred ninety-one".