127242991 has 2 divisors, whose sum is σ = 127242992. Its totient is φ = 127242990.

The previous prime is 127242979. The next prime is 127243027. The reversal of 127242991 is 199242721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 127242991 - 2¹¹ = 127240943 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 127242991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127242491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63621495 + 63621496.

It is an arithmetic number, because the mean of its divisors is an integer number (63621496).

Almost surely, 2^127242991 is an apocalyptic number.

127242991 is a deficient number, since it is larger than the sum of its proper divisors (1).

127242991 is an equidigital number, since it uses as much as digits as its factorization.

127242991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 127242991 is about 11280.2034999374. The cubic root of 127242991 is about 502.9729428535.

The spelling of 127242991 in words is "one hundred twenty-seven million, two hundred forty-two thousand, nine hundred ninety-one".