6980291721 has 40 divisors (see below), whose sum is σ = 11533016264. Its totient is φ = 4179444480.

The previous prime is 6980291719. The next prime is 6980291723. The reversal of 6980291721 is 1271920896.

It is an interprime number because it is at equal distance from previous prime (6980291719) and next prime (6980291723).

It can be written as a sum of positive squares in 4 ways, for example, as 2728599696 + 4251692025 = 52236^2 + 65205^2 .

It is not a de Polignac number, because 6980291721 - 2¹ = 6980291719 is a prime.

It is a super-3 number, since 3×6980291721³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6980291723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 50620 + ... + 128541.

Almost surely, 2^6980291721 is an apocalyptic number.

It is an amenable number.

6980291721 is a deficient number, since it is larger than the sum of its proper divisors (4552724543).

6980291721 is a wasteful number, since it uses less digits than its factorization.

6980291721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179223 (or 179214 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 6980291721 is about 83548.1401408793. The cubic root of 6980291721 is about 1911.1342295103.

The spelling of 6980291721 in words is "six billion, nine hundred eighty million, two hundred ninety-one thousand, seven hundred twenty-one".