26191691 has 2 divisors, whose sum is σ = 26191692. Its totient is φ = 26191690.

The previous prime is 26191663. The next prime is 26191703. The reversal of 26191691 is 19619162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26191691 - 2²² = 21997387 is a prime.

It is not a weakly prime, because it can be changed into another prime (26191391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13095845 + 13095846.

It is an arithmetic number, because the mean of its divisors is an integer number (13095846).

Almost surely, 2^26191691 is an apocalyptic number.

26191691 is a deficient number, since it is larger than the sum of its proper divisors (1).

26191691 is an equidigital number, since it uses as much as digits as its factorization.

26191691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 35.

The square root of 26191691 is about 5117.7818437288. The cubic root of 26191691 is about 296.9758810768.

The spelling of 26191691 in words is "twenty-six million, one hundred ninety-one thousand, six hundred ninety-one".