491849591109 has 8 divisors (see below), whose sum is σ = 656071467552. Its totient is φ = 327763721040.

The previous prime is 491849591081. The next prime is 491849591117. The reversal of 491849591109 is 901195948194.

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

It is not a de Polignac number, because 491849591109 - 2⁹ = 491849590597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491849595109) 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, 33993154 + ... + 34007619.

It is an arithmetic number, because the mean of its divisors is an integer number (82008933444).

Almost surely, 2^491849591109 is an apocalyptic number.

It is an amenable number.

491849591109 is a deficient number, since it is larger than the sum of its proper divisors (164221876443).

491849591109 is a wasteful number, since it uses less digits than its factorization.

491849591109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68003187.

The product of its (nonzero) digits is 4199040, while the sum is 60.

The spelling of 491849591109 in words is "four hundred ninety-one billion, eight hundred forty-nine million, five hundred ninety-one thousand, one hundred nine".