506018991 has 32 divisors (see below), whose sum is σ = 728870400. Its totient is φ = 311122944.

The previous prime is 506018977. The next prime is 506019011. The reversal of 506018991 is 199810605.

It is not a de Polignac number, because 506018991 - 2⁹ = 506018479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (506018951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 740536 + ... + 741218.

It is an arithmetic number, because the mean of its divisors is an integer number (22777200).

Almost surely, 2^506018991 is an apocalyptic number.

506018991 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

506018991 is a deficient number, since it is larger than the sum of its proper divisors (222851409).

506018991 is a wasteful number, since it uses less digits than its factorization.

506018991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 506018991 is about 22494.8658809071. The cubic root of 506018991 is about 796.8726819279.

The spelling of 506018991 in words is "five hundred six million, eighteen thousand, nine hundred ninety-one".