491905718573 has 16 divisors (see below), whose sum is σ = 511131025776. Its totient is φ = 473032949760.

The previous prime is 491905718543. The next prime is 491905718581. The reversal of 491905718573 is 375817509194.

It can be written as a sum of positive squares in 8 ways, for example, as 183789691849 + 308116026724 = 428707^2 + 555082^2 .

It is a cyclic number.

It is not a de Polignac number, because 491905718573 - 2⁶ = 491905718509 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 (491905718543) 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, 4728365 + ... + 4831277.

It is an arithmetic number, because the mean of its divisors is an integer number (31945689111).

Almost surely, 2^491905718573 is an apocalyptic number.

It is an amenable number.

491905718573 is a deficient number, since it is larger than the sum of its proper divisors (19225307203).

491905718573 is a wasteful number, since it uses less digits than its factorization.

491905718573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104624.

The product of its (nonzero) digits is 9525600, while the sum is 59.

The spelling of 491905718573 in words is "four hundred ninety-one billion, nine hundred five million, seven hundred eighteen thousand, five hundred seventy-three".