491840511 has 4 divisors (see below), whose sum is σ = 655787352. Its totient is φ = 327893672.

The previous prime is 491840497. The next prime is 491840543. The reversal of 491840511 is 115048194.

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 491840511 - 2¹⁰ = 491839487 is a prime.

It is a super-2 number, since 2×491840511² = 483814176521482242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491844511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81973416 + ... + 81973421.

It is an arithmetic number, because the mean of its divisors is an integer number (163946838).

Almost surely, 2^491840511 is an apocalyptic number.

491840511 is a deficient number, since it is larger than the sum of its proper divisors (163946841).

491840511 is a wasteful number, since it uses less digits than its factorization.

491840511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163946840.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 491840511 is about 22177.4775617066. The cubic root of 491840511 is about 789.3593647294.

The spelling of 491840511 in words is "four hundred ninety-one million, eight hundred forty thousand, five hundred eleven".