26689613 has 2 divisors, whose sum is σ = 26689614. Its totient is φ = 26689612.

The previous prime is 26689589. The next prime is 26689633. The reversal of 26689613 is 31698662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20043529 + 6646084 = 4477^2 + 2578^2 .

It is a cyclic number.

It is not a de Polignac number, because 26689613 - 2¹² = 26685517 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26689633) 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, 13344806 + 13344807.

It is an arithmetic number, because the mean of its divisors is an integer number (13344807).

Almost surely, 2^26689613 is an apocalyptic number.

It is an amenable number.

26689613 is a deficient number, since it is larger than the sum of its proper divisors (1).

26689613 is an equidigital number, since it uses as much as digits as its factorization.

26689613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 41.

The square root of 26689613 is about 5166.1990863690. The cubic root of 26689613 is about 298.8459850422.

The spelling of 26689613 in words is "twenty-six million, six hundred eighty-nine thousand, six hundred thirteen".