509766085 has 4 divisors (see below), whose sum is σ = 611719308. Its totient is φ = 407812864.

The previous prime is 509765987. The next prime is 509766091. The reversal of 509766085 is 580667905.

It is a Cunningham number, because it is equal to 22578²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 580667905 = 5 ⋅116133581.

It can be written as a sum of positive squares in 2 ways, for example, as 183494116 + 326271969 = 13546^2 + 18063^2 .

It is a cyclic number.

It is not a de Polignac number, because 509766085 - 2⁷ = 509765957 is a prime.

It is a super-2 number, since 2×509766085² = 519722922832454450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50976604 + ... + 50976613.

It is an arithmetic number, because the mean of its divisors is an integer number (152929827).

Almost surely, 2^509766085 is an apocalyptic number.

It is an amenable number.

509766085 is a deficient number, since it is larger than the sum of its proper divisors (101953223).

509766085 is a wasteful number, since it uses less digits than its factorization.

509766085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101953222.

The product of its (nonzero) digits is 453600, while the sum is 46.

The square root of 509766085 is about 22578.0000221455. Note that the first 4 decimals coincide. The cubic root of 509766085 is about 798.8348063327.

The spelling of 509766085 in words is "five hundred nine million, seven hundred sixty-six thousand, eighty-five".