6942807981 has 24 divisors (see below), whose sum is σ = 10240205976. Its totient is φ = 4531213440.

The previous prime is 6942807979. The next prime is 6942808003. The reversal of 6942807981 is 1897082496.

It can be written as a sum of positive squares in 4 ways, for example, as 977562756 + 5965245225 = 31266^2 + 77235^2 .

It is not a de Polignac number, because 6942807981 - 2¹ = 6942807979 is a prime.

It is a super-2 number, since 2×6942807981² = 96405165322074592722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6942807941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 204111 + ... + 235683.

It is an arithmetic number, because the mean of its divisors is an integer number (426675249).

Almost surely, 2^6942807981 is an apocalyptic number.

It is an amenable number.

6942807981 is a deficient number, since it is larger than the sum of its proper divisors (3297397995).

6942807981 is a wasteful number, since it uses less digits than its factorization.

6942807981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32093 (or 32090 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The square root of 6942807981 is about 83323.5139741478. The cubic root of 6942807981 is about 1907.7071965079.

The spelling of 6942807981 in words is "six billion, nine hundred forty-two million, eight hundred seven thousand, nine hundred eighty-one".