491968642 has 8 divisors (see below), whose sum is σ = 805039632. Its totient is φ = 223622100.

The previous prime is 491968621. The next prime is 491968649. The reversal of 491968642 is 246869194.

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

It is a super-2 number, since 2×491968642² = 484066289422648328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (491968649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11181084 + ... + 11181127.

It is an arithmetic number, because the mean of its divisors is an integer number (100629954).

Almost surely, 2^491968642 is an apocalyptic number.

491968642 is a deficient number, since it is larger than the sum of its proper divisors (313070990).

491968642 is a wasteful number, since it uses less digits than its factorization.

491968642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22362224.

The product of its digits is 746496, while the sum is 49.

The square root of 491968642 is about 22180.3661376452. The cubic root of 491968642 is about 789.4279049851.

It can be divided in two parts, 49 and 1968642, that added together give a palindrome (1968691).

The spelling of 491968642 in words is "four hundred ninety-one million, nine hundred sixty-eight thousand, six hundred forty-two".