515681913 has 8 divisors (see below), whose sum is σ = 706159168. Its totient is φ = 334496304.

The previous prime is 515681867. The next prime is 515681917. The reversal of 515681913 is 319186515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 515681913 - 2¹⁰ = 515680889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (515681917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2322781 + ... + 2323002.

It is an arithmetic number, because the mean of its divisors is an integer number (88269896).

Almost surely, 2^515681913 is an apocalyptic number.

It is an amenable number.

515681913 is a deficient number, since it is larger than the sum of its proper divisors (190477255).

515681913 is a wasteful number, since it uses less digits than its factorization.

515681913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4645823.

The product of its digits is 32400, while the sum is 39.

The square root of 515681913 is about 22708.6308041678. The cubic root of 515681913 is about 801.9130845087.

The spelling of 515681913 in words is "five hundred fifteen million, six hundred eighty-one thousand, nine hundred thirteen".