6511315971 has 4 divisors (see below), whose sum is σ = 8681754632. Its totient is φ = 4340877312.

The previous prime is 6511315969. The next prime is 6511315999. The reversal of 6511315971 is 1795131156.

6511315971 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 6511315971 - 2¹ = 6511315969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6511315931) 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, 1085219326 + ... + 1085219331.

It is an arithmetic number, because the mean of its divisors is an integer number (2170438658).

Almost surely, 2^6511315971 is an apocalyptic number.

6511315971 is a deficient number, since it is larger than the sum of its proper divisors (2170438661).

6511315971 is a wasteful number, since it uses less digits than its factorization.

6511315971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2170438660.

The product of its digits is 28350, while the sum is 39.

The square root of 6511315971 is about 80692.7256386844. The cubic root of 6511315971 is about 1867.3379502368.

The spelling of 6511315971 in words is "six billion, five hundred eleven million, three hundred fifteen thousand, nine hundred seventy-one".