26206391 has 2 divisors, whose sum is σ = 26206392. Its totient is φ = 26206390.

The previous prime is 26206379. The next prime is 26206399. The reversal of 26206391 is 19360262.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26206391 is a prime.

It is equal to p_1636580 and since 26206391 and 1636580 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26206399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13103195 + 13103196.

It is an arithmetic number, because the mean of its divisors is an integer number (13103196).

Almost surely, 2^26206391 is an apocalyptic number.

26206391 is a deficient number, since it is larger than the sum of its proper divisors (1).

26206391 is an equidigital number, since it uses as much as digits as its factorization.

26206391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 26206391 is about 5119.2178113458. The cubic root of 26206391 is about 297.0314295965.

The spelling of 26206391 in words is "twenty-six million, two hundred six thousand, three hundred ninety-one".