6989449897 has 8 divisors (see below), whose sum is σ = 7091621576. Its totient is φ = 6887452032.

The previous prime is 6989449879. The next prime is 6989449963. The reversal of 6989449897 is 7989449896.

It can be written as a sum of positive squares in 4 ways, for example, as 3164841 + 6986285056 = 1779^2 + 83584^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6989449897 - 2⁷ = 6989449769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (73).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6989446897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38683 + ... + 124399.

It is an arithmetic number, because the mean of its divisors is an integer number (886452697).

Almost surely, 2^6989449897 is an apocalyptic number.

It is an amenable number.

6989449897 is a deficient number, since it is larger than the sum of its proper divisors (102171679).

6989449897 is a wasteful number, since it uses less digits than its factorization.

6989449897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86907.

The product of its digits is 282175488, while the sum is 73.

The square root of 6989449897 is about 83602.9299546374. The cubic root of 6989449897 is about 1911.9696699881.

Subtracting 6989449897 from its reverse (7989449896), we obtain a palindrome (999999999).

The spelling of 6989449897 in words is "six billion, nine hundred eighty-nine million, four hundred forty-nine thousand, eight hundred ninety-seven".