1306517 has 2 divisors, whose sum is σ = 1306518. Its totient is φ = 1306516.

The previous prime is 1306499. The next prime is 1306519. The reversal of 1306517 is 7156031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1100401 + 206116 = 1049^2 + 454^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1306517 is a prime.

Together with 1306519, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1306492 and 1306501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1306519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 653258 + 653259.

It is an arithmetic number, because the mean of its divisors is an integer number (653259).

2^1306517 is an apocalyptic number.

It is an amenable number.

1306517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1306517 is an equidigital number, since it uses as much as digits as its factorization.

1306517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 1306517 is about 1143.0297458947. The cubic root of 1306517 is about 109.3213589487.

The spelling of 1306517 in words is "one million, three hundred six thousand, five hundred seventeen".