511985 has 4 divisors (see below), whose sum is σ = 614388. Its totient is φ = 409584.

The previous prime is 511963. The next prime is 511991. The reversal of 511985 is 589115.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 234256 + 277729 = 484^2 + 527^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-511985 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 511985.

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, 51194 + ... + 51203.

It is an arithmetic number, because the mean of its divisors is an integer number (153597).

2⁵¹¹⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

511985 is a deficient number, since it is larger than the sum of its proper divisors (102403).

511985 is a wasteful number, since it uses less digits than its factorization.

511985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102402.

The product of its digits is 1800, while the sum is 29.

The square root of 511985 is about 715.5312711545. The cubic root of 511985 is about 79.9992187424. Note that the first 3 decimals are identical.

The spelling of 511985 in words is "five hundred eleven thousand, nine hundred eighty-five".