509897917 has 2 divisors, whose sum is σ = 509897918. Its totient is φ = 509897916.

The previous prime is 509897909. The next prime is 509897953. The reversal of 509897917 is 719798905.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 412658596 + 97239321 = 20314^2 + 9861^2 .

It is a cyclic number.

It is not a de Polignac number, because 509897917 - 2³ = 509897909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509897957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254948958 + 254948959.

It is an arithmetic number, because the mean of its divisors is an integer number (254948959).

Almost surely, 2^509897917 is an apocalyptic number.

It is an amenable number.

509897917 is a deficient number, since it is larger than the sum of its proper divisors (1).

509897917 is an equidigital number, since it uses as much as digits as its factorization.

509897917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1428840, while the sum is 55.

The square root of 509897917 is about 22580.9193125524. The cubic root of 509897917 is about 798.9036633479.

The spelling of 509897917 in words is "five hundred nine million, eight hundred ninety-seven thousand, nine hundred seventeen".