491943508 has 24 divisors (see below), whose sum is σ = 984985344. Its totient is φ = 210597600.

The previous prime is 491943493. The next prime is 491943511. The reversal of 491943508 is 805349194.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17013 + ... + 35683.

It is an arithmetic number, because the mean of its divisors is an integer number (41041056).

Almost surely, 2^491943508 is an apocalyptic number.

It is an amenable number.

491943508 is an abundant number, since it is smaller than the sum of its proper divisors (493041836).

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

491943508 is a wasteful number, since it uses less digits than its factorization.

491943508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19623 (or 19621 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 491943508 is about 22179.7995482376. The cubic root of 491943508 is about 789.4144611615.

The spelling of 491943508 in words is "four hundred ninety-one million, nine hundred forty-three thousand, five hundred eight".