191017632427 has 2 divisors, whose sum is σ = 191017632428. Its totient is φ = 191017632426.

The previous prime is 191017632401. The next prime is 191017632433. The reversal of 191017632427 is 724236710191.

191017632427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 191017632427 - 2¹⁵ = 191017599659 is a prime.

It is not a weakly prime, because it can be changed into another prime (191017632467) 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, 95508816213 + 95508816214.

It is an arithmetic number, because the mean of its divisors is an integer number (95508816214).

Almost surely, 2^191017632427 is an apocalyptic number.

191017632427 is a deficient number, since it is larger than the sum of its proper divisors (1).

191017632427 is an equidigital number, since it uses as much as digits as its factorization.

191017632427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 43.

The spelling of 191017632427 in words is "one hundred ninety-one billion, seventeen million, six hundred thirty-two thousand, four hundred twenty-seven".