491644978276 has 9 divisors (see below), whose sum is σ = 860381166099. Its totient is φ = 245821787964.

The previous prime is 491644978273. The next prime is 491644978303. The reversal of 491644978276 is 672879446194.

The square root of 491644978276 is 701174.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491644978271) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1227055 + ... + 1577641.

Almost surely, 2^491644978276 is an apocalyptic number.

491644978276 is the 701174-th square number.

It is an amenable number.

491644978276 is a deficient number, since it is larger than the sum of its proper divisors (368736187823).

491644978276 is an frugal number, since it uses more digits than its factorization.

491644978276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701178 (or 350589 counting only the distinct ones).

The product of its digits is 146313216, while the sum is 67.

The spelling of 491644978276 in words is "four hundred ninety-one billion, six hundred forty-four million, nine hundred seventy-eight thousand, two hundred seventy-six".