491020844420 has 12 divisors (see below), whose sum is σ = 1031143773324. Its totient is φ = 196408337760.

The previous prime is 491020844407. The next prime is 491020844467. The reversal of 491020844420 is 24448020194.

It can be written as a sum of positive squares in 2 ways, for example, as 300154962496 + 190865881924 = 547864^2 + 436882^2 .

It is a super-2 number, since 2×491020844420² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12275521091 + ... + 12275521130.

It is an arithmetic number, because the mean of its divisors is an integer number (85928647777).

Almost surely, 2^491020844420 is an apocalyptic number.

It is an amenable number.

491020844420 is an abundant number, since it is smaller than the sum of its proper divisors (540122928904).

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

491020844420 is a wasteful number, since it uses less digits than its factorization.

491020844420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24551042230 (or 24551042228 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 38.

The spelling of 491020844420 in words is "four hundred ninety-one billion, twenty million, eight hundred forty-four thousand, four hundred twenty".