516981913 has 4 divisors (see below), whose sum is σ = 590836480. Its totient is φ = 443127348.

The previous prime is 516981889. The next prime is 516981919. The reversal of 516981913 is 319189615.

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, and also an emirpimes, since its reverse is a distinct semiprime: 319189615 = 5 ⋅63837923.

It is a cyclic number.

It is not a de Polignac number, because 516981913 - 2²⁵ = 483427481 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 516981913.

It is not an unprimeable number, because it can be changed into a prime (516981919) 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, 36927273 + ... + 36927286.

It is an arithmetic number, because the mean of its divisors is an integer number (147709120).

Almost surely, 2^516981913 is an apocalyptic number.

It is an amenable number.

516981913 is a deficient number, since it is larger than the sum of its proper divisors (73854567).

516981913 is an equidigital number, since it uses as much as digits as its factorization.

516981913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73854566.

The product of its digits is 58320, while the sum is 43.

The square root of 516981913 is about 22737.2362656502. The cubic root of 516981913 is about 802.5863756693.

The spelling of 516981913 in words is "five hundred sixteen million, nine hundred eighty-one thousand, nine hundred thirteen".