6731521315 has 4 divisors (see below), whose sum is σ = 8077825584. Its totient is φ = 5385217048.

The previous prime is 6731521309. The next prime is 6731521339. The reversal of 6731521315 is 5131251376.

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 6731521315 - 2¹⁹ = 6730997027 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 673152127 + ... + 673152136.

It is an arithmetic number, because the mean of its divisors is an integer number (2019456396).

Almost surely, 2^6731521315 is an apocalyptic number.

6731521315 is a deficient number, since it is larger than the sum of its proper divisors (1346304269).

6731521315 is a wasteful number, since it uses less digits than its factorization.

6731521315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346304268.

The product of its digits is 18900, while the sum is 34.

The square root of 6731521315 is about 82045.8488590373. The cubic root of 6731521315 is about 1888.1554295270.

The spelling of 6731521315 in words is "six billion, seven hundred thirty-one million, five hundred twenty-one thousand, three hundred fifteen".