6513681 has 8 divisors (see below), whose sum is σ = 8709120. Its totient is φ = 4330352.

The previous prime is 6513677. The next prime is 6513691. The reversal of 6513681 is 1863156.

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

It is a cyclic number.

It is not a de Polignac number, because 6513681 - 2² = 6513677 is a prime.

It is a super-2 number, since 2×6513681² = 84856080339522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6513671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1686 + ... + 3983.

It is an arithmetic number, because the mean of its divisors is an integer number (1088640).

Almost surely, 2^6513681 is an apocalyptic number.

It is an amenable number.

6513681 is a deficient number, since it is larger than the sum of its proper divisors (2195439).

6513681 is a wasteful number, since it uses less digits than its factorization.

6513681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6055.

The product of its digits is 4320, while the sum is 30.

The square root of 6513681 is about 2552.1914113169. The cubic root of 6513681 is about 186.7564006630.

The spelling of 6513681 in words is "six million, five hundred thirteen thousand, six hundred eighty-one".