26981609 has 2 divisors, whose sum is σ = 26981610. Its totient is φ = 26981608.

The previous prime is 26981569. The next prime is 26981627. The reversal of 26981609 is 90618962.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26491609 + 490000 = 5147^2 + 700^2 .

It is a cyclic number.

It is not a de Polignac number, because 26981609 - 2¹² = 26977513 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26981639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13490804 + 13490805.

It is an arithmetic number, because the mean of its divisors is an integer number (13490805).

Almost surely, 2^26981609 is an apocalyptic number.

It is an amenable number.

26981609 is a deficient number, since it is larger than the sum of its proper divisors (1).

26981609 is an equidigital number, since it uses as much as digits as its factorization.

26981609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 26981609 is about 5194.3824464512. The cubic root of 26981609 is about 299.9318697139.

The spelling of 26981609 in words is "twenty-six million, nine hundred eighty-one thousand, six hundred nine".