491445865024 has 21 divisors (see below), whose sum is σ = 975224017417. Its totient is φ = 245720128384.

The previous prime is 491445865021. The next prime is 491445865039. The reversal of 491445865024 is 420568544194.

The square root of 491445865024 is 701032.

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., 15235458624 + 476210406400 = 123432^2 + 690080^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491445865021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5564442 + ... + 5652070.

Almost surely, 2^491445865024 is an apocalyptic number.

491445865024 is the 701032-nd square number.

It is an amenable number.

491445865024 is a deficient number, since it is larger than the sum of its proper divisors (483778152393).

491445865024 is an frugal number, since it uses more digits than its factorization.

491445865024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175270 (or 87631 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 52.

The spelling of 491445865024 in words is "four hundred ninety-one billion, four hundred forty-five million, eight hundred sixty-five thousand, twenty-four".