127991297 has 32 divisors (see below), whose sum is σ = 160358400. Its totient is φ = 99747648.

The previous prime is 127991287. The next prime is 127991309. The reversal of 127991297 is 792199721.

It is not a de Polignac number, because 127991297 - 2⁸ = 127991041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (127991207) 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 in 31 ways as a sum of consecutive naturals, for example, 368678 + ... + 369024.

It is an arithmetic number, because the mean of its divisors is an integer number (5011200).

Almost surely, 2^127991297 is an apocalyptic number.

It is an amenable number.

127991297 is a deficient number, since it is larger than the sum of its proper divisors (32367103).

127991297 is a wasteful number, since it uses less digits than its factorization.

127991297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485.

The product of its digits is 142884, while the sum is 47.

The square root of 127991297 is about 11313.3238705519. The cubic root of 127991297 is about 503.9569977273.

The spelling of 127991297 in words is "one hundred twenty-seven million, nine hundred ninety-one thousand, two hundred ninety-seven".