491751216 has 80 divisors (see below), whose sum is σ = 1539841920. Its totient is φ = 149014080.

The previous prime is 491751193. The next prime is 491751223. The reversal of 491751216 is 612157194.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46990 + ... + 56493.

It is an arithmetic number, because the mean of its divisors is an integer number (19248024).

Almost surely, 2^491751216 is an apocalyptic number.

It is an amenable number.

491751216 is an abundant number, since it is smaller than the sum of its proper divisors (1048090704).

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

491751216 is a wasteful number, since it uses less digits than its factorization.

491751216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103511 (or 103499 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 491751216 is about 22175.4642792434. The cubic root of 491751216 is about 789.3115917156.

The spelling of 491751216 in words is "four hundred ninety-one million, seven hundred fifty-one thousand, two hundred sixteen".