1275681 has 32 divisors (see below), whose sum is σ = 2027520. Its totient is φ = 705600.

The previous prime is 1275667. The next prime is 1275683. The reversal of 1275681 is 1865721.

It is not a de Polignac number, because 1275681 - 2⁷ = 1275553 is a prime.

It is a super-2 number, since 2×1275681² = 3254724027522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1275683) 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 31 ways as a sum of consecutive naturals, for example, 29646 + ... + 29688.

It is an arithmetic number, because the mean of its divisors is an integer number (63360).

It is a Poulet number, since it divides 2^1275680-1.

2^1275681 is an apocalyptic number.

1275681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1275681 is a deficient number, since it is larger than the sum of its proper divisors (751839).

1275681 is a wasteful number, since it uses less digits than its factorization.

1275681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117.

The product of its digits is 3360, while the sum is 30.

The square root of 1275681 is about 1129.4604906769. The cubic root of 1275681 is about 108.4544465344.

The spelling of 1275681 in words is "one million, two hundred seventy-five thousand, six hundred eighty-one".