491161455 has 16 divisors (see below), whose sum is σ = 873176160. Its totient is φ = 261952704.

The previous prime is 491161453. The next prime is 491161459. The reversal of 491161455 is 554161194.

491161455 is a `hidden beast` number, since 49 + 1 + 161 + 455 = 666.

It is not a de Polignac number, because 491161455 - 2¹ = 491161453 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491161453) 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 15 ways as a sum of consecutive naturals, for example, 1818982 + ... + 1819251.

It is an arithmetic number, because the mean of its divisors is an integer number (54573510).

Almost surely, 2^491161455 is an apocalyptic number.

491161455 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

491161455 is a deficient number, since it is larger than the sum of its proper divisors (382014705).

491161455 is a wasteful number, since it uses less digits than its factorization.

491161455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3638247 (or 3638241 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 491161455 is about 22162.1626877884. The cubic root of 491161455 is about 788.9959230080.

It can be divided in two parts, 4911 and 61455, that added together give a palindrome (66366).

The spelling of 491161455 in words is "four hundred ninety-one million, one hundred sixty-one thousand, four hundred fifty-five".