6981631579 has 16 divisors (see below), whose sum is σ = 7588510720. Its totient is φ = 6384873600.

The previous prime is 6981631543. The next prime is 6981631583. The reversal of 6981631579 is 9751361896.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 6981631579 - 2⁹ = 6981631067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6981631079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1366129 + ... + 1371229.

It is an arithmetic number, because the mean of its divisors is an integer number (474281920).

Almost surely, 2^6981631579 is an apocalyptic number.

6981631579 is a deficient number, since it is larger than the sum of its proper divisors (606879141).

6981631579 is a wasteful number, since it uses less digits than its factorization.

6981631579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6070.

The product of its digits is 2449440, while the sum is 55.

The square root of 6981631579 is about 83556.1582350457. The cubic root of 6981631579 is about 1911.2565016048.

The spelling of 6981631579 in words is "six billion, nine hundred eighty-one million, six hundred thirty-one thousand, five hundred seventy-nine".