491129738 has 8 divisors (see below), whose sum is σ = 803666880. Its totient is φ = 223240780.

The previous prime is 491129729. The next prime is 491129783. The reversal of 491129738 is 837921194.

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

It is a Curzon number.

It is an unprimeable number.

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, 11162018 + ... + 11162061.

It is an arithmetic number, because the mean of its divisors is an integer number (100458360).

Almost surely, 2^491129738 is an apocalyptic number.

491129738 is a deficient number, since it is larger than the sum of its proper divisors (312537142).

491129738 is a wasteful number, since it uses less digits than its factorization.

491129738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22324092.

The product of its digits is 108864, while the sum is 44.

The square root of 491129738 is about 22161.4471097896. The cubic root of 491129738 is about 788.9789393719.

The spelling of 491129738 in words is "four hundred ninety-one million, one hundred twenty-nine thousand, seven hundred thirty-eight".