27800100191 has 2 divisors, whose sum is σ = 27800100192. Its totient is φ = 27800100190.

The previous prime is 27800100169. The next prime is 27800100199. The reversal of 27800100191 is 19100100872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27800100191 - 2²² = 27795905887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27800100199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13900050095 + 13900050096.

It is an arithmetic number, because the mean of its divisors is an integer number (13900050096).

Almost surely, 2^27800100191 is an apocalyptic number.

27800100191 is a deficient number, since it is larger than the sum of its proper divisors (1).

27800100191 is an equidigital number, since it uses as much as digits as its factorization.

27800100191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 29.

The spelling of 27800100191 in words is "twenty-seven billion, eight hundred million, one hundred thousand, one hundred ninety-one".