491884943 has 4 divisors (see below), whose sum is σ = 536601768. Its totient is φ = 447168120.

The previous prime is 491884931. The next prime is 491884949. The reversal of 491884943 is 349488194.

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

It is a cyclic number.

It is not a de Polignac number, because 491884943 - 2¹⁰ = 491883919 is a prime.

It is a super-2 number, since 2×491884943² = 483901594300226498, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491884891 and 491884900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491884949) 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, 22358396 + ... + 22358417.

It is an arithmetic number, because the mean of its divisors is an integer number (134150442).

Almost surely, 2^491884943 is an apocalyptic number.

491884943 is a deficient number, since it is larger than the sum of its proper divisors (44716825).

491884943 is a wasteful number, since it uses less digits than its factorization.

491884943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44716824.

The product of its digits is 995328, while the sum is 50.

The square root of 491884943 is about 22178.4792760910. The cubic root of 491884943 is about 789.3831337889.

The spelling of 491884943 in words is "four hundred ninety-one million, eight hundred eighty-four thousand, nine hundred forty-three".