127991047 has 2 divisors, whose sum is σ = 127991048. Its totient is φ = 127991046.

The previous prime is 127991041. The next prime is 127991051. The reversal of 127991047 is 740199721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 127991047 - 2¹⁵ = 127958279 is a prime.

It is a super-2 number, since 2×127991047² = 32763416224312418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127991041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63995523 + 63995524.

It is an arithmetic number, because the mean of its divisors is an integer number (63995524).

Almost surely, 2^127991047 is an apocalyptic number.

127991047 is a deficient number, since it is larger than the sum of its proper divisors (1).

127991047 is an equidigital number, since it uses as much as digits as its factorization.

127991047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 127991047 is about 11313.3128216274. The cubic root of 127991047 is about 503.9566696078.

The spelling of 127991047 in words is "one hundred twenty-seven million, nine hundred ninety-one thousand, forty-seven".