506555621 has 16 divisors (see below), whose sum is σ = 597421440. Its totient is φ = 423433920.

The previous prime is 506555603. The next prime is 506555627. The reversal of 506555621 is 126555605.

It is not a de Polignac number, because 506555621 - 2¹⁰ = 506554597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (506555627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30875 + ... + 44343.

It is an arithmetic number, because the mean of its divisors is an integer number (37338840).

Almost surely, 2^506555621 is an apocalyptic number.

It is an amenable number.

506555621 is a deficient number, since it is larger than the sum of its proper divisors (90865819).

506555621 is a wasteful number, since it uses less digits than its factorization.

506555621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13756.

The product of its (nonzero) digits is 45000, while the sum is 35.

The square root of 506555621 is about 22506.7905530753. The cubic root of 506555621 is about 797.1542752535.

The spelling of 506555621 in words is "five hundred six million, five hundred fifty-five thousand, six hundred twenty-one".