191271998927 has 2 divisors, whose sum is σ = 191271998928. Its totient is φ = 191271998926.

The previous prime is 191271998861. The next prime is 191271999013. The reversal of 191271998927 is 729899172191.

191271998927 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 191271998927 - 2¹⁸ = 191271736783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191271998227) 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, 95635999463 + 95635999464.

It is an arithmetic number, because the mean of its divisors is an integer number (95635999464).

Almost surely, 2^191271998927 is an apocalyptic number.

191271998927 is a deficient number, since it is larger than the sum of its proper divisors (1).

191271998927 is an equidigital number, since it uses as much as digits as its factorization.

191271998927 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10287648, while the sum is 65.

The spelling of 191271998927 in words is "one hundred ninety-one billion, two hundred seventy-one million, nine hundred ninety-eight thousand, nine hundred twenty-seven".