491209275368 has 32 divisors (see below), whose sum is σ = 1098356146560. Its totient is φ = 201365292480.

The previous prime is 491209275367. The next prime is 491209275371. The reversal of 491209275368 is 863572902194.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is not an unprimeable number, because it can be changed into a prime (491209275367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190685543 + ... + 190688118.

It is an arithmetic number, because the mean of its divisors is an integer number (34323629580).

It is a 2-persistent number, because it is pandigital, and so is 2⋅491209275368 = 982418550736, but 3⋅491209275368 = 1473627826104 is not.

Almost surely, 2^491209275368 is an apocalyptic number.

It is an amenable number.

491209275368 is an abundant number, since it is smaller than the sum of its proper divisors (607146871192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491209275368 is a wasteful number, since it uses less digits than its factorization.

491209275368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381373697 (or 381373693 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 56.

The spelling of 491209275368 in words is "four hundred ninety-one billion, two hundred nine million, two hundred seventy-five thousand, three hundred sixty-eight".