27891441749 has 2 divisors, whose sum is σ = 27891441750. Its totient is φ = 27891441748.

The previous prime is 27891441691. The next prime is 27891441751. The reversal of 27891441749 is 94714419872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25032935524 + 2858506225 = 158218^2 + 53465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27891441749 is a prime.

Together with 27891441751, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 27891441694 and 27891441703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27891441769) 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, 13945720874 + 13945720875.

It is an arithmetic number, because the mean of its divisors is an integer number (13945720875).

Almost surely, 2^27891441749 is an apocalyptic number.

It is an amenable number.

27891441749 is a deficient number, since it is larger than the sum of its proper divisors (1).

27891441749 is an equidigital number, since it uses as much as digits as its factorization.

27891441749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 56.

The spelling of 27891441749 in words is "twenty-seven billion, eight hundred ninety-one million, four hundred forty-one thousand, seven hundred forty-nine".