491953518 has 48 divisors (see below), whose sum is σ = 1221423840. Its totient is φ = 140182848.

The previous prime is 491953507. The next prime is 491953519. The reversal of 491953518 is 815359194.

491953518 is a `hidden beast` number, since 49 + 1 + 95 + 3 + 518 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491953519) 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 23 ways as a sum of consecutive naturals, for example, 43996 + ... + 54032.

It is an arithmetic number, because the mean of its divisors is an integer number (25446330).

Almost surely, 2^491953518 is an apocalyptic number.

491953518 is an abundant number, since it is smaller than the sum of its proper divisors (729470322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491953518 is a wasteful number, since it uses less digits than its factorization.

491953518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10441 (or 10438 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The square root of 491953518 is about 22180.0252028712. The cubic root of 491953518 is about 789.4198154248.

The spelling of 491953518 in words is "four hundred ninety-one million, nine hundred fifty-three thousand, five hundred eighteen".