6515347081 has 4 divisors (see below), whose sum is σ = 6638278212. Its totient is φ = 6392415952.

The previous prime is 6515347063. The next prime is 6515347093. The reversal of 6515347081 is 1807435156.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5788775056 + 726572025 = 76084^2 + 26955^2 .

It is a cyclic number.

It is not a de Polignac number, because 6515347081 - 2⁷ = 6515346953 is a prime.

It is a super-2 number, since 2×6515347081² = 84899495171790441122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6515347381) 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, 61465486 + ... + 61465591.

It is an arithmetic number, because the mean of its divisors is an integer number (1659569553).

Almost surely, 2^6515347081 is an apocalyptic number.

It is an amenable number.

6515347081 is a deficient number, since it is larger than the sum of its proper divisors (122931131).

6515347081 is a wasteful number, since it uses less digits than its factorization.

6515347081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122931130.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 6515347081 is about 80717.6999238705. The cubic root of 6515347081 is about 1867.7232226792.

The spelling of 6515347081 in words is "six billion, five hundred fifteen million, three hundred forty-seven thousand, eighty-one".