27891441691 has 2 divisors, whose sum is σ = 27891441692. Its totient is φ = 27891441690.

The previous prime is 27891441661. The next prime is 27891441749. The reversal of 27891441691 is 19614419872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27891441691 - 2²³ = 27883053083 is a prime.

It is not a weakly prime, because it can be changed into another prime (27891441631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13945720845 + 13945720846.

It is an arithmetic number, because the mean of its divisors is an integer number (13945720846).

Almost surely, 2^27891441691 is an apocalyptic number.

27891441691 is a deficient number, since it is larger than the sum of its proper divisors (1).

27891441691 is an equidigital number, since it uses as much as digits as its factorization.

27891441691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 52.

The spelling of 27891441691 in words is "twenty-seven billion, eight hundred ninety-one million, four hundred forty-one thousand, six hundred ninety-one".