26381009 has 2 divisors, whose sum is σ = 26381010. Its totient is φ = 26381008.

The previous prime is 26380979. The next prime is 26381011. The reversal of 26381009 is 90018362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14326225 + 12054784 = 3785^2 + 3472^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26381009 is a prime.

Together with 26381011, 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 (26381309) 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, 13190504 + 13190505.

It is an arithmetic number, because the mean of its divisors is an integer number (13190505).

Almost surely, 2^26381009 is an apocalyptic number.

It is an amenable number.

26381009 is a deficient number, since it is larger than the sum of its proper divisors (1).

26381009 is an equidigital number, since it uses as much as digits as its factorization.

26381009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 26381009 is about 5136.2446398122. The cubic root of 26381009 is about 297.6896947104.

The spelling of 26381009 in words is "twenty-six million, three hundred eighty-one thousand, nine".