1312681 has 2 divisors, whose sum is σ = 1312682. Its totient is φ = 1312680.

The previous prime is 1312673. The next prime is 1312733. The reversal of 1312681 is 1862131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 810000 + 502681 = 900^2 + 709^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312681 - 2³ = 1312673 is a prime.

It is a super-2 number, since 2×1312681² = 3446262815522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1312601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656340 + 656341.

It is an arithmetic number, because the mean of its divisors is an integer number (656341).

2^1312681 is an apocalyptic number.

It is an amenable number.

1312681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312681 is an equidigital number, since it uses as much as digits as its factorization.

1312681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 22.

The square root of 1312681 is about 1145.7229158920. The cubic root of 1312681 is about 109.4930112371.

The spelling of 1312681 in words is "one million, three hundred twelve thousand, six hundred eighty-one".