491775853 has 8 divisors (see below), whose sum is σ = 504952056. Its totient is φ = 478656000.

The previous prime is 491775833. The next prime is 491775863. The reversal of 491775853 is 358577194.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11377129 + 480398724 = 3373^2 + 21918^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 491775853 - 2¹⁷ = 491644781 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491775797 and 491775806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491775833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3903 + ... + 31603.

It is an arithmetic number, because the mean of its divisors is an integer number (63119007).

Almost surely, 2^491775853 is an apocalyptic number.

It is an amenable number.

491775853 is a deficient number, since it is larger than the sum of its proper divisors (13176203).

491775853 is a wasteful number, since it uses less digits than its factorization.

491775853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28175.

The product of its digits is 1058400, while the sum is 49.

The square root of 491775853 is about 22176.0197736203. The cubic root of 491775853 is about 789.3247731403.

The spelling of 491775853 in words is "four hundred ninety-one million, seven hundred seventy-five thousand, eight hundred fifty-three".