491944856 has 16 divisors (see below), whose sum is σ = 993350400. Its totient is φ = 227051424.

The previous prime is 491944853. The next prime is 491944867. The reversal of 491944856 is 658449194.

It is a super-3 number, since 3×491944856³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491944853) 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, 2365016 + ... + 2365223.

It is an arithmetic number, because the mean of its divisors is an integer number (62084400).

Almost surely, 2^491944856 is an apocalyptic number.

It is an amenable number.

491944856 is an abundant number, since it is smaller than the sum of its proper divisors (501405544).

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

491944856 is a wasteful number, since it uses less digits than its factorization.

491944856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4730258 (or 4730254 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 50.

The square root of 491944856 is about 22179.8299362281. The cubic root of 491944856 is about 789.4151821994.

The spelling of 491944856 in words is "four hundred ninety-one million, nine hundred forty-four thousand, eight hundred fifty-six".