1286617 has 2 divisors, whose sum is σ = 1286618. Its totient is φ = 1286616.

The previous prime is 1286587. The next prime is 1286629. The reversal of 1286617 is 7166821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 839056 + 447561 = 916^2 + 669^2 .

It is a cyclic number.

It is not a de Polignac number, because 1286617 - 2⁷ = 1286489 is a prime.

It is a Chen prime.

1286617 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1286647) 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 as a sum of consecutive naturals, namely, 643308 + 643309.

It is an arithmetic number, because the mean of its divisors is an integer number (643309).

2^1286617 is an apocalyptic number.

It is an amenable number.

1286617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1286617 is an equidigital number, since it uses as much as digits as its factorization.

1286617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 31.

The square root of 1286617 is about 1134.2914087658. The cubic root of 1286617 is about 108.7634800747.

The spelling of 1286617 in words is "one million, two hundred eighty-six thousand, six hundred seventeen".