6509081 has 4 divisors (see below), whose sum is σ = 6524964. Its totient is φ = 6493200.

The previous prime is 6509033. The next prime is 6509093. The reversal of 6509081 is 1809056.

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 462400 + 6046681 = 680^2 + 2459^2 .

It is a cyclic number.

It is not a de Polignac number, because 6509081 - 2⁶ = 6509017 is a prime.

It is a super-2 number, since 2×6509081² = 84736270929122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6509681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7310 + ... + 8151.

It is an arithmetic number, because the mean of its divisors is an integer number (1631241).

Almost surely, 2^6509081 is an apocalyptic number.

It is an amenable number.

6509081 is a deficient number, since it is larger than the sum of its proper divisors (15883).

6509081 is a wasteful number, since it uses less digits than its factorization.

6509081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15882.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 6509081 is about 2551.2900658294. The cubic root of 6509081 is about 186.7124274856.

The spelling of 6509081 in words is "six million, five hundred nine thousand, eighty-one".