1271055681 has 12 divisors (see below), whose sum is σ = 2098250752. Its totient is φ = 726317496.

The previous prime is 1271055661. The next prime is 1271055697. The reversal of 1271055681 is 1865501721.

1271055681 is a `hidden beast` number, since 1 + 27 + 1 + 0 + 556 + 81 = 666.

It is not a de Polignac number, because 1271055681 - 2¹¹ = 1271053633 is a prime.

It is a super-2 number, since 2×1271055681² = 3231165088404747522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1271055631) 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 11 ways as a sum of consecutive naturals, for example, 10087681 + ... + 10087806.

Almost surely, 2^1271055681 is an apocalyptic number.

It is an amenable number.

1271055681 is a deficient number, since it is larger than the sum of its proper divisors (827195071).

1271055681 is a wasteful number, since it uses less digits than its factorization.

1271055681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20175500 (or 20175497 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 36.

The square root of 1271055681 is about 35651.8678472812. The cubic root of 1271055681 is about 1083.2321103267.

The spelling of 1271055681 in words is "one billion, two hundred seventy-one million, fifty-five thousand, six hundred eighty-one".