26291191 has 2 divisors, whose sum is σ = 26291192. Its totient is φ = 26291190.

The previous prime is 26291147. The next prime is 26291207. The reversal of 26291191 is 19119262.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26291191 - 2¹¹ = 26289143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26291101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13145595 + 13145596.

It is an arithmetic number, because the mean of its divisors is an integer number (13145596).

Almost surely, 2^26291191 is an apocalyptic number.

26291191 is a deficient number, since it is larger than the sum of its proper divisors (1).

26291191 is an equidigital number, since it uses as much as digits as its factorization.

26291191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 31.

The square root of 26291191 is about 5127.4936372462. The cubic root of 26291191 is about 297.3514678836.

The spelling of 26291191 in words is "twenty-six million, two hundred ninety-one thousand, one hundred ninety-one".