1306663 has 2 divisors, whose sum is σ = 1306664. Its totient is φ = 1306662.

The previous prime is 1306661. The next prime is 1306667. The reversal of 1306663 is 3666031.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1306663 - 2¹ = 1306661 is a prime.

Together with 1306661, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1306661) 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, 653331 + 653332.

It is an arithmetic number, because the mean of its divisors is an integer number (653332).

2^1306663 is an apocalyptic number.

1306663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1306663 is an equidigital number, since it uses as much as digits as its factorization.

1306663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 1306663 is about 1143.0936094651. The cubic root of 1306663 is about 109.3254309263.

The spelling of 1306663 in words is "one million, three hundred six thousand, six hundred sixty-three".