26830861 has 2 divisors, whose sum is σ = 26830862. Its totient is φ = 26830860.

The previous prime is 26830823. The next prime is 26830871. The reversal of 26830861 is 16803862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19096900 + 7733961 = 4370^2 + 2781^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26830861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26830801) 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, 13415430 + 13415431.

It is an arithmetic number, because the mean of its divisors is an integer number (13415431).

Almost surely, 2^26830861 is an apocalyptic number.

26830861 is the 2317-th centered decagonal number.

It is an amenable number.

26830861 is a deficient number, since it is larger than the sum of its proper divisors (1).

26830861 is an equidigital number, since it uses as much as digits as its factorization.

26830861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 26830861 is about 5179.8514457463. The cubic root of 26830861 is about 299.3722465944.

The spelling of 26830861 in words is "twenty-six million, eight hundred thirty thousand, eight hundred sixty-one".