6981640297 has 4 divisors (see below), whose sum is σ = 7170333316. Its totient is φ = 6792947280.

The previous prime is 6981640249. The next prime is 6981640313. The reversal of 6981640297 is 7920461896.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6746815321 + 234824976 = 82139^2 + 15324^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6981640297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6981640217) 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, 94346454 + ... + 94346527.

It is an arithmetic number, because the mean of its divisors is an integer number (1792583329).

Almost surely, 2^6981640297 is an apocalyptic number.

It is an amenable number.

6981640297 is a deficient number, since it is larger than the sum of its proper divisors (188693019).

6981640297 is a wasteful number, since it uses less digits than its factorization.

6981640297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188693018.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The square root of 6981640297 is about 83556.2104035361. The cubic root of 6981640297 is about 1911.2572971365.

The spelling of 6981640297 in words is "six billion, nine hundred eighty-one million, six hundred forty thousand, two hundred ninety-seven".