512665 has 4 divisors (see below), whose sum is σ = 615204. Its totient is φ = 410128.

The previous prime is 512663. The next prime is 512671. The reversal of 512665 is 566215.

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 186624 + 326041 = 432^2 + 571^2 .

It is a cyclic number.

It is not a de Polignac number, because 512665 - 2¹ = 512663 is a prime.

It is a Duffinian number.

512665 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (512663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51262 + ... + 51271.

It is an arithmetic number, because the mean of its divisors is an integer number (153801).

2⁵¹²⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

512665 is a deficient number, since it is larger than the sum of its proper divisors (102539).

512665 is a wasteful number, since it uses less digits than its factorization.

512665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102538.

The product of its digits is 1800, while the sum is 25.

The square root of 512665 is about 716.0062848886. The cubic root of 512665 is about 80.0346204323.

The spelling of 512665 in words is "five hundred twelve thousand, six hundred sixty-five".