510985 has 4 divisors (see below), whose sum is σ = 613188. Its totient is φ = 408784.

The previous prime is 510943. The next prime is 510989. The reversal of 510985 is 589015.

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 300304 + 210681 = 548^2 + 459^2 .

It is a cyclic number.

It is not a de Polignac number, because 510985 - 2¹⁷ = 379913 is a prime.

It is a super-2 number, since 2×510985² = 522211340450, which contains 22 as substring.

It is a Duffinian number.

510985 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (510989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51094 + ... + 51103.

It is an arithmetic number, because the mean of its divisors is an integer number (153297).

2⁵¹⁰⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

510985 is a deficient number, since it is larger than the sum of its proper divisors (102203).

510985 is a wasteful number, since it uses less digits than its factorization.

510985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102202.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 510985 is about 714.8321481299. The cubic root of 510985 is about 79.9471004448.

The spelling of 510985 in words is "five hundred ten thousand, nine hundred eighty-five".