491641928 has 32 divisors (see below), whose sum is σ = 965986560. Its totient is φ = 234136320.

The previous prime is 491641879. The next prime is 491641961. The reversal of 491641928 is 829146194.

It is a Cunningham number, because it is equal to 22173²-1.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38801 + ... + 49887.

It is an arithmetic number, because the mean of its divisors is an integer number (30187080).

Almost surely, 2^491641928 is an apocalyptic number.

It is an amenable number.

491641928 is a deficient number, since it is larger than the sum of its proper divisors (474344632).

491641928 is a wasteful number, since it uses less digits than its factorization.

491641928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11357 (or 11353 counting only the distinct ones).

The product of its digits is 124416, while the sum is 44.

The square root of 491641928 is about 22172.9999774501. Note that the first 4 decimals coincide. The cubic root of 491641928 is about 789.2531145334.

The spelling of 491641928 in words is "four hundred ninety-one million, six hundred forty-one thousand, nine hundred twenty-eight".