26381609 has 2 divisors, whose sum is σ = 26381610. Its totient is φ = 26381608.

The previous prime is 26381567. The next prime is 26381611. The reversal of 26381609 is 90618362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18835600 + 7546009 = 4340^2 + 2747^2 .

It is a cyclic number.

It is not a de Polignac number, because 26381609 - 2¹² = 26377513 is a prime.

Together with 26381611, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26381659) 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, 13190804 + 13190805.

It is an arithmetic number, because the mean of its divisors is an integer number (13190805).

Almost surely, 2^26381609 is an apocalyptic number.

It is an amenable number.

26381609 is a deficient number, since it is larger than the sum of its proper divisors (1).

26381609 is an equidigital number, since it uses as much as digits as its factorization.

26381609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 26381609 is about 5136.3030479130. The cubic root of 26381609 is about 297.6919515417.

The spelling of 26381609 in words is "twenty-six million, three hundred eighty-one thousand, six hundred nine".