127928191 has 2 divisors, whose sum is σ = 127928192. Its totient is φ = 127928190.

The previous prime is 127928189. The next prime is 127928201. The reversal of 127928191 is 191829721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 127928191 - 2¹ = 127928189 is a prime.

Together with 127928189, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127928161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63964095 + 63964096.

It is an arithmetic number, because the mean of its divisors is an integer number (63964096).

Almost surely, 2^127928191 is an apocalyptic number.

127928191 is a deficient number, since it is larger than the sum of its proper divisors (1).

127928191 is an equidigital number, since it uses as much as digits as its factorization.

127928191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 40.

The square root of 127928191 is about 11310.5345143366. The cubic root of 127928191 is about 503.8741589217.

The spelling of 127928191 in words is "one hundred twenty-seven million, nine hundred twenty-eight thousand, one hundred ninety-one".