646446517 has 2 divisors, whose sum is σ = 646446518. Its totient is φ = 646446516.

The previous prime is 646446491. The next prime is 646446529. The reversal of 646446517 is 715644646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 597362481 + 49084036 = 24441^2 + 7006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646446517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646440517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323223258 + 323223259.

It is an arithmetic number, because the mean of its divisors is an integer number (323223259).

Almost surely, 2^646446517 is an apocalyptic number.

It is an amenable number.

646446517 is a deficient number, since it is larger than the sum of its proper divisors (1).

646446517 is an equidigital number, since it uses as much as digits as its factorization.

646446517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 43.

The square root of 646446517 is about 25425.3125251195. The cubic root of 646446517 is about 864.6576733552.

The spelling of 646446517 in words is "six hundred forty-six million, four hundred forty-six thousand, five hundred seventeen".