491120817 has 32 divisors (see below), whose sum is σ = 769499136. Its totient is φ = 275510400.

The previous prime is 491120767. The next prime is 491120893. The reversal of 491120817 is 718021194.

It is not a de Polignac number, because 491120817 - 2⁶ = 491120753 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (491122817) 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, 13093 + ... + 33965.

It is an arithmetic number, because the mean of its divisors is an integer number (24046848).

Almost surely, 2^491120817 is an apocalyptic number.

It is an amenable number.

491120817 is a deficient number, since it is larger than the sum of its proper divisors (278378319).

491120817 is a wasteful number, since it uses less digits than its factorization.

491120817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20941.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 491120817 is about 22161.2458359182. The cubic root of 491120817 is about 788.9741622745.

The spelling of 491120817 in words is "four hundred ninety-one million, one hundred twenty thousand, eight hundred seventeen".