1272772681 has 2 divisors, whose sum is σ = 1272772682. Its totient is φ = 1272772680.

The previous prime is 1272772679. The next prime is 1272772727. The reversal of 1272772681 is 1862772721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1263162681 + 9610000 = 35541^2 + 3100^2 .

It is a cyclic number.

It is not a de Polignac number, because 1272772681 - 2¹ = 1272772679 is a prime.

It is a super-2 number, since 2×1272772681² = 3239900594999855522, which contains 22 as substring.

Together with 1272772679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1272778681) 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, 636386340 + 636386341.

It is an arithmetic number, because the mean of its divisors is an integer number (636386341).

Almost surely, 2^1272772681 is an apocalyptic number.

It is an amenable number.

1272772681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272772681 is an equidigital number, since it uses as much as digits as its factorization.

1272772681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 131712, while the sum is 43.

The square root of 1272772681 is about 35675.9398054207. The cubic root of 1272772681 is about 1083.7196506460.

The spelling of 1272772681 in words is "one billion, two hundred seventy-two million, seven hundred seventy-two thousand, six hundred eighty-one".