127801081 has 2 divisors, whose sum is σ = 127801082. Its totient is φ = 127801080.

The previous prime is 127801067. The next prime is 127801099. The reversal of 127801081 is 180108721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112466025 + 15335056 = 10605^2 + 3916^2 .

It is a cyclic number.

It is not a de Polignac number, because 127801081 - 2¹¹ = 127799033 is a prime.

It is a super-2 number, since 2×127801081² = 32666232609537122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (127801001) 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, 63900540 + 63900541.

It is an arithmetic number, because the mean of its divisors is an integer number (63900541).

Almost surely, 2^127801081 is an apocalyptic number.

It is an amenable number.

127801081 is a deficient number, since it is larger than the sum of its proper divisors (1).

127801081 is an equidigital number, since it uses as much as digits as its factorization.

127801081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 127801081 is about 11304.9140200180. The cubic root of 127801081 is about 503.7072197763.

It can be divided in two parts, 12780 and 1081, that added together give a triangular number (13861 = T₁₆₆).

The spelling of 127801081 in words is "one hundred twenty-seven million, eight hundred one thousand, eighty-one".