491011943 has 4 divisors (see below), whose sum is σ = 497738208. Its totient is φ = 484285680.

The previous prime is 491011933. The next prime is 491011967. The reversal of 491011943 is 349110194.

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 491011943 - 2²⁶ = 423903079 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 (491011933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3363023 + ... + 3363168.

It is an arithmetic number, because the mean of its divisors is an integer number (124434552).

Almost surely, 2^491011943 is an apocalyptic number.

491011943 is a deficient number, since it is larger than the sum of its proper divisors (6726265).

491011943 is an equidigital number, since it uses as much as digits as its factorization.

491011943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6726264.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 491011943 is about 22158.7892945441. The cubic root of 491011943 is about 788.9158567834.

The spelling of 491011943 in words is "four hundred ninety-one million, eleven thousand, nine hundred forty-three".