491056543 has 4 divisors (see below), whose sum is σ = 519942240. Its totient is φ = 462170848.

The previous prime is 491056453. The next prime is 491056547. The reversal of 491056543 is 345650194.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491056543 is a prime.

It is a super-2 number, since 2×491056543² = 482273056846221698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491056547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14442823 + ... + 14442856.

It is an arithmetic number, because the mean of its divisors is an integer number (129985560).

Almost surely, 2^491056543 is an apocalyptic number.

491056543 is a deficient number, since it is larger than the sum of its proper divisors (28885697).

491056543 is a wasteful number, since it uses less digits than its factorization.

491056543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28885696.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 491056543 is about 22159.7956443646. The cubic root of 491056543 is about 788.9397425446.

The spelling of 491056543 in words is "four hundred ninety-one million, fifty-six thousand, five hundred forty-three".