6519109081 has 9 divisors (see below), whose sum is σ = 6565376181. Its totient is φ = 6473167452.

The previous prime is 6519109039. The next prime is 6519109087. The reversal of 6519109081 is 1809019156.

The square root of 6519109081 is 80741.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 6519109081 - 2²¹ = 6517011929 is a prime.

It is a super-2 number, since 2×6519109081² = 84997566419953329122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6519109087) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 21234730 + ... + 21235036.

Almost surely, 2^6519109081 is an apocalyptic number.

6519109081 is the 80741-st square number.

6519109081 is the 40371-st centered octagonal number.

It is an amenable number.

6519109081 is a deficient number, since it is larger than the sum of its proper divisors (46267100).

6519109081 is an frugal number, since it uses more digits than its factorization.

6519109081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140 (or 570 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 40.

The cubic root of 6519109081 is about 1868.0826316641.

It can be divided in two parts, 6519 and 109081, that added together give a square (115600 = 340²).

The spelling of 6519109081 in words is "six billion, five hundred nineteen million, one hundred nine thousand, eighty-one".