6491346905 has 4 divisors (see below), whose sum is σ = 7789616292. Its totient is φ = 5193077520.

The previous prime is 6491346899. The next prime is 6491346907. The reversal of 6491346905 is 5096431946.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5096431946 = 2 ⋅2548215973.

It can be written as a sum of positive squares in 2 ways, for example, as 706071184 + 5785275721 = 26572^2 + 76061^2 .

It is not a de Polignac number, because 6491346905 - 2⁴ = 6491346889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6491346905.

It is not an unprimeable number, because it can be changed into a prime (6491346907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 649134686 + ... + 649134695.

It is an arithmetic number, because the mean of its divisors is an integer number (1947404073).

Almost surely, 2^6491346905 is an apocalyptic number.

It is an amenable number.

6491346905 is a deficient number, since it is larger than the sum of its proper divisors (1298269387).

6491346905 is a wasteful number, since it uses less digits than its factorization.

6491346905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298269386.

The product of its (nonzero) digits is 699840, while the sum is 47.

The square root of 6491346905 is about 80568.8953939422. The cubic root of 6491346905 is about 1865.4270626054.

The spelling of 6491346905 in words is "six billion, four hundred ninety-one million, three hundred forty-six thousand, nine hundred five".