6315131021 has 4 divisors (see below), whose sum is σ = 6422167200. Its totient is φ = 6208094844.

The previous prime is 6315130967. The next prime is 6315131047. The reversal of 6315131021 is 1201315136.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6315131021 - 2²² = 6310936717 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 (6315131051) 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, 53518001 + ... + 53518118.

It is an arithmetic number, because the mean of its divisors is an integer number (1605541800).

Almost surely, 2^6315131021 is an apocalyptic number.

It is an amenable number.

6315131021 is a deficient number, since it is larger than the sum of its proper divisors (107036179).

6315131021 is a wasteful number, since it uses less digits than its factorization.

6315131021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107036178.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 6315131021 is about 79467.7986419657. The cubic root of 6315131021 is about 1848.3921770520.

Adding to 6315131021 its reverse (1201315136), we get a palindrome (7516446157).

The spelling of 6315131021 in words is "six billion, three hundred fifteen million, one hundred thirty-one thousand, twenty-one".