517809161 has 2 divisors, whose sum is σ = 517809162. Its totient is φ = 517809160.

The previous prime is 517809107. The next prime is 517809163. The reversal of 517809161 is 161908715.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 370793536 + 147015625 = 19256^2 + 12125^2 .

It is a cyclic number.

It is not a de Polignac number, because 517809161 - 2¹⁴ = 517792777 is a prime.

Together with 517809163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (517809163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258904580 + 258904581.

It is an arithmetic number, because the mean of its divisors is an integer number (258904581).

Almost surely, 2^517809161 is an apocalyptic number.

It is an amenable number.

517809161 is a deficient number, since it is larger than the sum of its proper divisors (1).

517809161 is an equidigital number, since it uses as much as digits as its factorization.

517809161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 38.

The square root of 517809161 is about 22755.4204751308. The cubic root of 517809161 is about 803.0142334200.

The spelling of 517809161 in words is "five hundred seventeen million, eight hundred nine thousand, one hundred sixty-one".