491265980 has 12 divisors (see below), whose sum is σ = 1031658600. Its totient is φ = 196506384.

The previous prime is 491265953. The next prime is 491265989. The reversal of 491265980 is 89562194.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491265989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12281630 + ... + 12281669.

It is an arithmetic number, because the mean of its divisors is an integer number (85971550).

Almost surely, 2^491265980 is an apocalyptic number.

It is an amenable number.

491265980 is an abundant number, since it is smaller than the sum of its proper divisors (540392620).

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

491265980 is a wasteful number, since it uses less digits than its factorization.

491265980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24563308 (or 24563306 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 491265980 is about 22164.5207482589. The cubic root of 491265980 is about 789.0518882774.

The spelling of 491265980 in words is "four hundred ninety-one million, two hundred sixty-five thousand, nine hundred eighty".