6936591981 has 16 divisors (see below), whose sum is σ = 10104015168. Its totient is φ = 4197984000.

The previous prime is 6936591979. The next prime is 6936592021. The reversal of 6936591981 is 1891956396.

It is not a de Polignac number, because 6936591981 - 2¹ = 6936591979 is a prime.

It is a super-2 number, since 2×6936591981² = 96232616621747008722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6936591281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126796 + ... + 173061.

It is an arithmetic number, because the mean of its divisors is an integer number (631500948).

Almost surely, 2^6936591981 is an apocalyptic number.

It is an amenable number.

6936591981 is a deficient number, since it is larger than the sum of its proper divisors (3167423187).

6936591981 is a wasteful number, since it uses less digits than its factorization.

6936591981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300572.

The product of its digits is 3149280, while the sum is 57.

The square root of 6936591981 is about 83286.2052263158. The cubic root of 6936591981 is about 1907.1376935681.

The spelling of 6936591981 in words is "six billion, nine hundred thirty-six million, five hundred ninety-one thousand, nine hundred eighty-one".