506530891 has 4 divisors (see below), whose sum is σ = 517308192. Its totient is φ = 495753592.

The previous prime is 506530877. The next prime is 506530901. The reversal of 506530891 is 198035605.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198035605 = 5 ⋅39607121.

It is a cyclic number.

It is not a de Polignac number, because 506530891 - 2¹¹ = 506528843 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 506530891.

It is not an unprimeable number, because it can be changed into a prime (506530391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5388580 + ... + 5388673.

It is an arithmetic number, because the mean of its divisors is an integer number (129327048).

Almost surely, 2^506530891 is an apocalyptic number.

506530891 is a deficient number, since it is larger than the sum of its proper divisors (10777301).

506530891 is a wasteful number, since it uses less digits than its factorization.

506530891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10777300.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 506530891 is about 22506.2411566214. The cubic root of 506530891 is about 797.1413027090.

The spelling of 506530891 in words is "five hundred six million, five hundred thirty thousand, eight hundred ninety-one".