491353863 has 32 divisors (see below), whose sum is σ = 879631872. Its totient is φ = 235612800.

The previous prime is 491353861. The next prime is 491353879. The reversal of 491353863 is 368353194.

It is not a de Polignac number, because 491353863 - 2¹ = 491353861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491353861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78808 + ... + 84813.

It is an arithmetic number, because the mean of its divisors is an integer number (27488496).

Almost surely, 2^491353863 is an apocalyptic number.

491353863 is a deficient number, since it is larger than the sum of its proper divisors (388278009).

491353863 is a wasteful number, since it uses less digits than its factorization.

491353863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163655.

The product of its digits is 233280, while the sum is 42.

The square root of 491353863 is about 22166.5031748357. The cubic root of 491353863 is about 789.0989368657.

The spelling of 491353863 in words is "four hundred ninety-one million, three hundred fifty-three thousand, eight hundred sixty-three".