506656621 has 4 divisors (see below), whose sum is σ = 507139744. Its totient is φ = 506173500.

The previous prime is 506656607. The next prime is 506656637. The reversal of 506656621 is 126656605.

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 a cyclic number.

It is not a de Polignac number, because 506656621 - 2⁵ = 506656589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (506606621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239985 + ... + 242086.

It is an arithmetic number, because the mean of its divisors is an integer number (126784936).

Almost surely, 2^506656621 is an apocalyptic number.

It is an amenable number.

506656621 is a deficient number, since it is larger than the sum of its proper divisors (483123).

506656621 is a wasteful number, since it uses less digits than its factorization.

506656621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483122.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 506656621 is about 22509.0342085128. The cubic root of 506656621 is about 797.2072521482.

The spelling of 506656621 in words is "five hundred six million, six hundred fifty-six thousand, six hundred twenty-one".