6515270491 has 4 divisors (see below), whose sum is σ = 6515682984. Its totient is φ = 6514858000.

The previous prime is 6515270453. The next prime is 6515270497. The reversal of 6515270491 is 1940725156.

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

It is a cyclic number.

It is not a de Polignac number, because 6515270491 - 2¹⁷ = 6515139419 is a prime.

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 (6515270497) 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, 181570 + ... + 214471.

It is an arithmetic number, because the mean of its divisors is an integer number (1628920746).

Almost surely, 2^6515270491 is an apocalyptic number.

6515270491 is a deficient number, since it is larger than the sum of its proper divisors (412493).

6515270491 is a wasteful number, since it uses less digits than its factorization.

6515270491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412492.

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 6515270491 is about 80717.2254912172. The cubic root of 6515270491 is about 1867.7159040882.

The spelling of 6515270491 in words is "six billion, five hundred fifteen million, two hundred seventy thousand, four hundred ninety-one".