6491489798 has 4 divisors (see below), whose sum is σ = 9737234700. Its totient is φ = 3245744898.

The previous prime is 6491489791. The next prime is 6491489863. The reversal of 6491489798 is 8979841946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8979841946 = 2 ⋅4489920973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6491489791) 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 as a sum of consecutive naturals, namely, 1622872448 + ... + 1622872451.

It is an arithmetic number, because the mean of its divisors is an integer number (2434308675).

Almost surely, 2^6491489798 is an apocalyptic number.

6491489798 is a deficient number, since it is larger than the sum of its proper divisors (3245744902).

6491489798 is a wasteful number, since it uses less digits than its factorization.

6491489798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3245744901.

The product of its digits is 31352832, while the sum is 65.

The square root of 6491489798 is about 80569.7821642829. The cubic root of 6491489798 is about 1865.4407502893.

The spelling of 6491489798 in words is "six billion, four hundred ninety-one million, four hundred eighty-nine thousand, seven hundred ninety-eight".