6513823871 has 4 divisors (see below), whose sum is σ = 6516456072. Its totient is φ = 6511191672.

The previous prime is 6513823843. The next prime is 6513823879. The reversal of 6513823871 is 1783283156.

It is a happy number.

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 6513823871 - 2²⁶ = 6446715007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6513823879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1312385 + ... + 1317338.

It is an arithmetic number, because the mean of its divisors is an integer number (1629114018).

Almost surely, 2^6513823871 is an apocalyptic number.

6513823871 is a deficient number, since it is larger than the sum of its proper divisors (2632201).

6513823871 is a wasteful number, since it uses less digits than its factorization.

6513823871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2632200.

The product of its digits is 241920, while the sum is 44.

The square root of 6513823871 is about 80708.2639572925. The cubic root of 6513823871 is about 1867.5776609060.

The spelling of 6513823871 in words is "six billion, five hundred thirteen million, eight hundred twenty-three thousand, eight hundred seventy-one".