1226681 has 2 divisors, whose sum is σ = 1226682. Its totient is φ = 1226680.

The previous prime is 1226677. The next prime is 1226683. The reversal of 1226681 is 1866221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 714025 + 512656 = 845^2 + 716^2 .

It is a cyclic number.

It is not a de Polignac number, because 1226681 - 2² = 1226677 is a prime.

It is a super-2 number, since 2×1226681² = 3009492551522, which contains 22 as substring.

Together with 1226683, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1226681.

It is not a weakly prime, because it can be changed into another prime (1226683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613340 + 613341.

It is an arithmetic number, because the mean of its divisors is an integer number (613341).

2^1226681 is an apocalyptic number.

It is an amenable number.

1226681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1226681 is an equidigital number, since it uses as much as digits as its factorization.

1226681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 26.

The square root of 1226681 is about 1107.5563191098. The cubic root of 1226681 is about 107.0476685151.

The spelling of 1226681 in words is "one million, two hundred twenty-six thousand, six hundred eighty-one".