506811993 has 4 divisors (see below), whose sum is σ = 675749328. Its totient is φ = 337874660.

The previous prime is 506811979. The next prime is 506812001. The reversal of 506811993 is 399118605.

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 506811993 - 2⁸ = 506811737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (506811913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84468663 + ... + 84468668.

It is an arithmetic number, because the mean of its divisors is an integer number (168937332).

Almost surely, 2^506811993 is an apocalyptic number.

It is an amenable number.

506811993 is a deficient number, since it is larger than the sum of its proper divisors (168937335).

506811993 is a wasteful number, since it uses less digits than its factorization.

506811993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168937334.

The product of its (nonzero) digits is 58320, while the sum is 42.

The square root of 506811993 is about 22512.4852692900. The cubic root of 506811993 is about 797.2887347019.

The spelling of 506811993 in words is "five hundred six million, eight hundred eleven thousand, nine hundred ninety-three".