191728127 has 2 divisors, whose sum is σ = 191728128. Its totient is φ = 191728126.

The previous prime is 191728093. The next prime is 191728129. The reversal of 191728127 is 721827191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 191728127 - 2¹⁴ = 191711743 is a prime.

Together with 191728129, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191728129) 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, 95864063 + 95864064.

It is an arithmetic number, because the mean of its divisors is an integer number (95864064).

Almost surely, 2^191728127 is an apocalyptic number.

191728127 is a deficient number, since it is larger than the sum of its proper divisors (1).

191728127 is an equidigital number, since it uses as much as digits as its factorization.

191728127 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 38.

The square root of 191728127 is about 13846.5926133472. The cubic root of 191728127 is about 576.6274017763.

The spelling of 191728127 in words is "one hundred ninety-one million, seven hundred twenty-eight thousand, one hundred twenty-seven".