491574856 has 32 divisors (see below), whose sum is σ = 980281440. Its totient is φ = 230295808.

The previous prime is 491574851. The next prime is 491574869. The reversal of 491574856 is 658475194.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (491574851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22911 + ... + 38833.

It is an arithmetic number, because the mean of its divisors is an integer number (30633795).

Almost surely, 2^491574856 is an apocalyptic number.

It is an amenable number.

491574856 is a deficient number, since it is larger than the sum of its proper divisors (488706584).

491574856 is a wasteful number, since it uses less digits than its factorization.

491574856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16173 (or 16169 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 49.

The square root of 491574856 is about 22171.4874557392. The cubic root of 491574856 is about 789.2172217495.

The spelling of 491574856 in words is "four hundred ninety-one million, five hundred seventy-four thousand, eight hundred fifty-six".