127665491 has 2 divisors, whose sum is σ = 127665492. Its totient is φ = 127665490.

The previous prime is 127665463. The next prime is 127665509. The reversal of 127665491 is 194566721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 127665491 - 2¹⁸ = 127403347 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (127665451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63832745 + 63832746.

It is an arithmetic number, because the mean of its divisors is an integer number (63832746).

Almost surely, 2^127665491 is an apocalyptic number.

127665491 is a deficient number, since it is larger than the sum of its proper divisors (1).

127665491 is an equidigital number, since it uses as much as digits as its factorization.

127665491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 127665491 is about 11298.9154789298. The cubic root of 127665491 is about 503.5290214152.

The spelling of 127665491 in words is "one hundred twenty-seven million, six hundred sixty-five thousand, four hundred ninety-one".