512661 has 4 divisors (see below), whose sum is σ = 683552. Its totient is φ = 341772.

The previous prime is 512657. The next prime is 512663. The reversal of 512661 is 166215.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 512661 - 2² = 512657 is a prime.

It is a D-number.

It is a Duffinian number.

512661 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 512661.

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, 85441 + ... + 85446.

It is an arithmetic number, because the mean of its divisors is an integer number (170888).

2⁵¹²⁶⁶¹ is an apocalyptic number.

It is an amenable number.

512661 is a deficient number, since it is larger than the sum of its proper divisors (170891).

512661 is a wasteful number, since it uses less digits than its factorization.

512661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170890.

The product of its digits is 360, while the sum is 21.

The square root of 512661 is about 716.0034916116. The cubic root of 512661 is about 80.0344122786.

Adding to 512661 its reverse (166215), we get a palindrome (678876).

The spelling of 512661 in words is "five hundred twelve thousand, six hundred sixty-one".