491343263861 has 16 divisors (see below), whose sum is σ = 520999008768. Its totient is φ = 461771616000.

The previous prime is 491343263779. The next prime is 491343263867. The reversal of 491343263861 is 168362343194.

It is a cyclic number.

It is not a de Polignac number, because 491343263861 - 2²⁶ = 491276154997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491343263867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61792436 + ... + 61800386.

It is an arithmetic number, because the mean of its divisors is an integer number (32562438048).

Almost surely, 2^491343263861 is an apocalyptic number.

It is an amenable number.

491343263861 is a deficient number, since it is larger than the sum of its proper divisors (29655744907).

491343263861 is a wasteful number, since it uses less digits than its factorization.

491343263861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12772.

The product of its digits is 2239488, while the sum is 50.

The spelling of 491343263861 in words is "four hundred ninety-one billion, three hundred forty-three million, two hundred sixty-three thousand, eight hundred sixty-one".