491018753543 has 16 divisors (see below), whose sum is σ = 502154041632. Its totient is φ = 479985264000.

The previous prime is 491018753531. The next prime is 491018753591. The reversal of 491018753543 is 345357810194.

It is a cyclic number.

It is not a de Polignac number, because 491018753543 - 2²⁰ = 491017704967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491018753491 and 491018753500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491018953543) 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, 31345133 + ... + 31360793.

It is an arithmetic number, because the mean of its divisors is an integer number (31384627602).

Almost surely, 2^491018753543 is an apocalyptic number.

491018753543 is a deficient number, since it is larger than the sum of its proper divisors (11135288089).

491018753543 is a wasteful number, since it uses less digits than its factorization.

491018753543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18866.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 491018753543 in words is "four hundred ninety-one billion, eighteen million, seven hundred fifty-three thousand, five hundred forty-three".