1276281681 has 16 divisors (see below), whose sum is σ = 1802715264. Its totient is φ = 800401664.

The previous prime is 1276281659. The next prime is 1276281683. The reversal of 1276281681 is 1861826721.

It is a cyclic number.

It is not a de Polignac number, because 1276281681 - 2¹⁰ = 1276280657 is a prime.

It is a super-2 number, since 2×1276281681² = 3257789858512371522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1276281683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121276 + ... + 131378.

It is an arithmetic number, because the mean of its divisors is an integer number (112669704).

Almost surely, 2^1276281681 is an apocalyptic number.

It is an amenable number.

1276281681 is a deficient number, since it is larger than the sum of its proper divisors (526433583).

1276281681 is a wasteful number, since it uses less digits than its factorization.

1276281681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12600.

The product of its digits is 64512, while the sum is 42.

The square root of 1276281681 is about 35725.0847584719. The cubic root of 1276281681 is about 1084.7146654250.

The spelling of 1276281681 in words is "one billion, two hundred seventy-six million, two hundred eighty-one thousand, six hundred eighty-one".