491453178 has 8 divisors (see below), whose sum is σ = 982906368. Its totient is φ = 163817724.

The previous prime is 491453147. The next prime is 491453189. The reversal of 491453178 is 871354194.

It is a happy number.

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

491453178 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40954426 + ... + 40954437.

It is an arithmetic number, because the mean of its divisors is an integer number (122863296).

Almost surely, 2^491453178 is an apocalyptic number.

491453178 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

491453178 is a wasteful number, since it uses less digits than its factorization.

491453178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81908868.

The product of its digits is 120960, while the sum is 42.

The square root of 491453178 is about 22168.7432661394. The cubic root of 491453178 is about 789.1520988787.

The spelling of 491453178 in words is "four hundred ninety-one million, four hundred fifty-three thousand, one hundred seventy-eight".