26561111 has 2 divisors, whose sum is σ = 26561112. Its totient is φ = 26561110.

The previous prime is 26561099. The next prime is 26561131. The reversal of 26561111 is 11116562.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26561111 - 2¹⁸ = 26298967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26561131) 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, 13280555 + 13280556.

It is an arithmetic number, because the mean of its divisors is an integer number (13280556).

Almost surely, 2^26561111 is an apocalyptic number.

26561111 is a deficient number, since it is larger than the sum of its proper divisors (1).

26561111 is an equidigital number, since it uses as much as digits as its factorization.

26561111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 23.

The square root of 26561111 is about 5153.7472774671. The cubic root of 26561111 is about 298.3655971127.

Adding to 26561111 its reverse (11116562), we get a palindrome (37677673).

The spelling of 26561111 in words is "twenty-six million, five hundred sixty-one thousand, one hundred eleven".