491729122756 has 9 divisors (see below), whose sum is σ = 860528419149. Its totient is φ = 245863860144.

The previous prime is 491729122727. The next prime is 491729122769. The reversal of 491729122756 is 657221927194.

The square root of 491729122756 is 701234.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 409254472900 + 82474649856 = 639730^2 + 287184^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491729122697 and 491729122706.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1227160 + ... + 1577776.

Almost surely, 2^491729122756 is an apocalyptic number.

491729122756 is the 701234-th square number.

It is an amenable number.

491729122756 is a deficient number, since it is larger than the sum of its proper divisors (368799296393).

491729122756 is an frugal number, since it uses more digits than its factorization.

491729122756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701238 (or 350619 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 55.

The spelling of 491729122756 in words is "four hundred ninety-one billion, seven hundred twenty-nine million, one hundred twenty-two thousand, seven hundred fifty-six".