506385991 has 4 divisors (see below), whose sum is σ = 506434000. Its totient is φ = 506337984.

The previous prime is 506385983. The next prime is 506386031. The reversal of 506385991 is 199583605.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 506385991 - 2³ = 506385983 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 (506355991) 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 3 ways as a sum of consecutive naturals, for example, 531 + ... + 31828.

It is an arithmetic number, because the mean of its divisors is an integer number (126608500).

Almost surely, 2^506385991 is an apocalyptic number.

506385991 is a deficient number, since it is larger than the sum of its proper divisors (48009).

506385991 is a wasteful number, since it uses less digits than its factorization.

506385991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48008.

The product of its (nonzero) digits is 291600, while the sum is 46.

The square root of 506385991 is about 22503.0218193024. The cubic root of 506385991 is about 797.0652844492.

The spelling of 506385991 in words is "five hundred six million, three hundred eighty-five thousand, nine hundred ninety-one".