6491601185 has 4 divisors (see below), whose sum is σ = 7789921428. Its totient is φ = 5193280944.

The previous prime is 6491601163. The next prime is 6491601187. The reversal of 6491601185 is 5811061946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5811061946 = 2 ⋅2905530973.

It can be written as a sum of positive squares in 2 ways, for example, as 5095532689 + 1396068496 = 71383^2 + 37364^2 .

It is a cyclic number.

It is not a de Polignac number, because 6491601185 - 2²⁰ = 6490552609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6491601187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 649160114 + ... + 649160123.

It is an arithmetic number, because the mean of its divisors is an integer number (1947480357).

Almost surely, 2^6491601185 is an apocalyptic number.

It is an amenable number.

6491601185 is a deficient number, since it is larger than the sum of its proper divisors (1298320243).

6491601185 is a wasteful number, since it uses less digits than its factorization.

6491601185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298320242.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 6491601185 is about 80570.4734068257. The cubic root of 6491601185 is about 1865.4514198822.

The spelling of 6491601185 in words is "six billion, four hundred ninety-one million, six hundred one thousand, one hundred eighty-five".