26309189 has 2 divisors, whose sum is σ = 26309190. Its totient is φ = 26309188.

The previous prime is 26309161. The next prime is 26309191. The reversal of 26309189 is 98190362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18992164 + 7317025 = 4358^2 + 2705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26309189 is a prime.

Together with 26309191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26309089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13154594 + 13154595.

It is an arithmetic number, because the mean of its divisors is an integer number (13154595).

Almost surely, 2^26309189 is an apocalyptic number.

It is an amenable number.

26309189 is a deficient number, since it is larger than the sum of its proper divisors (1).

26309189 is an equidigital number, since it uses as much as digits as its factorization.

26309189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 26309189 is about 5129.2483854850. The cubic root of 26309189 is about 297.4193044324.

The spelling of 26309189 in words is "twenty-six million, three hundred nine thousand, one hundred eighty-nine".