26542009 has 4 divisors (see below), whose sum is σ = 28583716. Its totient is φ = 24500304.

The previous prime is 26541979. The next prime is 26542027. The reversal of 26542009 is 90024562.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90024562 = 2 ⋅45012281.

It can be written as a sum of positive squares in 2 ways, for example, as 11696400 + 14845609 = 3420^2 + 3853^2 .

It is a cyclic number.

It is not a de Polignac number, because 26542009 - 2¹⁹ = 26017721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26542039) 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 in 3 ways as a sum of consecutive naturals, for example, 1020834 + ... + 1020859.

It is an arithmetic number, because the mean of its divisors is an integer number (7145929).

Almost surely, 2^26542009 is an apocalyptic number.

It is an amenable number.

26542009 is a deficient number, since it is larger than the sum of its proper divisors (2041707).

26542009 is a wasteful number, since it uses less digits than its factorization.

26542009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2041706.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 26542009 is about 5151.8937294940. The cubic root of 26542009 is about 298.2940545925.

The spelling of 26542009 in words is "twenty-six million, five hundred forty-two thousand, nine".