6991910489 has 4 divisors (see below), whose sum is σ = 7003317156. Its totient is φ = 6980503824.

The previous prime is 6991910483. The next prime is 6991910543. The reversal of 6991910489 is 9840191996.

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 89624089 + 6902286400 = 9467^2 + 83080^2 .

It is a cyclic number.

It is not a de Polignac number, because 6991910489 - 2¹² = 6991906393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6991910483) 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, 5702414 + ... + 5703639.

It is an arithmetic number, because the mean of its divisors is an integer number (1750829289).

Almost surely, 2^6991910489 is an apocalyptic number.

It is an amenable number.

6991910489 is a deficient number, since it is larger than the sum of its proper divisors (11406667).

6991910489 is a wasteful number, since it uses less digits than its factorization.

6991910489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11406666.

The product of its (nonzero) digits is 1259712, while the sum is 56.

The square root of 6991910489 is about 83617.6446032774. The cubic root of 6991910489 is about 1912.1940093081.

It can be divided in two parts, 69919 and 10489, that added together give a palindrome (80408).

The spelling of 6991910489 in words is "six billion, nine hundred ninety-one million, nine hundred ten thousand, four hundred eighty-nine".