1268681 has 2 divisors, whose sum is σ = 1268682. Its totient is φ = 1268680.

The previous prime is 1268669. The next prime is 1268713. The reversal of 1268681 is 1868621.

It is an a-pointer prime, because the next prime (1268713) can be obtained adding 1268681 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1190281 + 78400 = 1091^2 + 280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1268681 is a prime.

It is a super-2 number, since 2×1268681² = 3219102959522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p₉₇₈₀₈ and since 1268681 and 97808 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1268621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634340 + 634341.

It is an arithmetic number, because the mean of its divisors is an integer number (634341).

2^1268681 is an apocalyptic number.

It is an amenable number.

1268681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268681 is an equidigital number, since it uses as much as digits as its factorization.

1268681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 32.

The square root of 1268681 is about 1126.3574033139. The cubic root of 1268681 is about 108.2557098116.

The spelling of 1268681 in words is "one million, two hundred sixty-eight thousand, six hundred eighty-one".