502661 has 4 divisors (see below), whose sum is σ = 504300. Its totient is φ = 501024.

The previous prime is 502651. The next prime is 502669. The reversal of 502661 is 166205.

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 481636 + 21025 = 694^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 502661 - 2⁶ = 502597 is a prime.

It is a Duffinian 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 502661.

It is not an unprimeable number, because it can be changed into a prime (502669) 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, 206 + ... + 1023.

It is an arithmetic number, because the mean of its divisors is an integer number (126075).

2⁵⁰²⁶⁶¹ is an apocalyptic number.

It is an amenable number.

502661 is a deficient number, since it is larger than the sum of its proper divisors (1639).

502661 is a wasteful number, since it uses less digits than its factorization.

502661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 502661 is about 708.9858954874. The cubic root of 502661 is about 79.5106060240.

Adding to 502661 its sum of digits (20), we get a square (502681 = 709²).

Adding to 502661 its reverse (166205), we get a palindrome (668866).

The spelling of 502661 in words is "five hundred two thousand, six hundred sixty-one".