1272427081 has 2 divisors, whose sum is σ = 1272427082. Its totient is φ = 1272427080.

The previous prime is 1272427043. The next prime is 1272427103. The reversal of 1272427081 is 1807242721.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1142102025 + 130325056 = 33795^2 + 11416^2 .

It is an emirp because it is prime and its reverse (1807242721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1272427081 - 2⁹ = 1272426569 is a prime.

It is a super-2 number, since 2×1272427081² = 3238141352924361122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1272437081) 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, 636213540 + 636213541.

It is an arithmetic number, because the mean of its divisors is an integer number (636213541).

Almost surely, 2^1272427081 is an apocalyptic number.

It is an amenable number.

1272427081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272427081 is an equidigital number, since it uses as much as digits as its factorization.

1272427081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12544, while the sum is 34.

The square root of 1272427081 is about 35671.0958760731. The cubic root of 1272427081 is about 1083.6215531561.

The spelling of 1272427081 in words is "one billion, two hundred seventy-two million, four hundred twenty-seven thousand, eighty-one".