516506491 has 4 divisors (see below), whose sum is σ = 516555832. Its totient is φ = 516457152.

The previous prime is 516506483. The next prime is 516506509. The reversal of 516506491 is 194605615.

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 516506491 - 2³ = 516506483 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 516506491.

It is not an unprimeable number, because it can be changed into a prime (516506401) 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, 2061 + ... + 32206.

It is an arithmetic number, because the mean of its divisors is an integer number (129138958).

Almost surely, 2^516506491 is an apocalyptic number.

516506491 is a deficient number, since it is larger than the sum of its proper divisors (49341).

516506491 is a wasteful number, since it uses less digits than its factorization.

516506491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49340.

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

The square root of 516506491 is about 22726.7791602770. The cubic root of 516506491 is about 802.3402779274.

The spelling of 516506491 in words is "five hundred sixteen million, five hundred six thousand, four hundred ninety-one".