517787089 has 2 divisors, whose sum is σ = 517787090. Its totient is φ = 517787088.

The previous prime is 517787087. The next prime is 517787113. The reversal of 517787089 is 980787715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 375700689 + 142086400 = 19383^2 + 11920^2 .

It is a cyclic number.

It is not a de Polignac number, because 517787089 - 2¹ = 517787087 is a prime.

Together with 517787087, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (517787087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258893544 + 258893545.

It is an arithmetic number, because the mean of its divisors is an integer number (258893545).

Almost surely, 2^517787089 is an apocalyptic number.

It is an amenable number.

517787089 is a deficient number, since it is larger than the sum of its proper divisors (1).

517787089 is an equidigital number, since it uses as much as digits as its factorization.

517787089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 987840, while the sum is 52.

The square root of 517787089 is about 22754.9354866148. The cubic root of 517787089 is about 803.0028235652.

The spelling of 517787089 in words is "five hundred seventeen million, seven hundred eighty-seven thousand, eighty-nine".