127098991 has 2 divisors, whose sum is σ = 127098992. Its totient is φ = 127098990.

The previous prime is 127098973. The next prime is 127098997. The reversal of 127098991 is 199890721.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (199890721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 127098991 - 2⁹ = 127098479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127098997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63549495 + 63549496.

It is an arithmetic number, because the mean of its divisors is an integer number (63549496).

Almost surely, 2^127098991 is an apocalyptic number.

127098991 is a deficient number, since it is larger than the sum of its proper divisors (1).

127098991 is an equidigital number, since it uses as much as digits as its factorization.

127098991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 46.

The square root of 127098991 is about 11273.8188294828. The cubic root of 127098991 is about 502.7831342506.

The spelling of 127098991 in words is "one hundred twenty-seven million, ninety-eight thousand, nine hundred ninety-one".