26118509 has 2 divisors, whose sum is σ = 26118510. Its totient is φ = 26118508.

The previous prime is 26118503. The next prime is 26118529. The reversal of 26118509 is 90581162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19758025 + 6360484 = 4445^2 + 2522^2 .

It is a cyclic number.

It is not a de Polignac number, because 26118509 - 2⁴ = 26118493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26118503) 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, 13059254 + 13059255.

It is an arithmetic number, because the mean of its divisors is an integer number (13059255).

Almost surely, 2^26118509 is an apocalyptic number.

It is an amenable number.

26118509 is a deficient number, since it is larger than the sum of its proper divisors (1).

26118509 is an equidigital number, since it uses as much as digits as its factorization.

26118509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 26118509 is about 5110.6270652436. The cubic root of 26118509 is about 296.6990304016.

The spelling of 26118509 in words is "twenty-six million, one hundred eighteen thousand, five hundred nine".