26189861 has 2 divisors, whose sum is σ = 26189862. Its totient is φ = 26189860.

The previous prime is 26189837. The next prime is 26189873. The reversal of 26189861 is 16898162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21104836 + 5085025 = 4594^2 + 2255^2 .

It is a cyclic number.

It is not a de Polignac number, because 26189861 - 2⁶ = 26189797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26189561) 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, 13094930 + 13094931.

It is an arithmetic number, because the mean of its divisors is an integer number (13094931).

Almost surely, 2^26189861 is an apocalyptic number.

It is an amenable number.

26189861 is a deficient number, since it is larger than the sum of its proper divisors (1).

26189861 is an equidigital number, since it uses as much as digits as its factorization.

26189861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 41.

The square root of 26189861 is about 5117.6030522111. The cubic root of 26189861 is about 296.9689643982.

The spelling of 26189861 in words is "twenty-six million, one hundred eighty-nine thousand, eight hundred sixty-one".