491309188 has 12 divisors (see below), whose sum is σ = 860560540. Its totient is φ = 245434752.

The previous prime is 491309183. The next prime is 491309207. The reversal of 491309188 is 881903194.

It can be written as a sum of positive squares in 2 ways, for example, as 157954624 + 333354564 = 12568^2 + 18258^2 .

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (491309183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49881 + ... + 58912.

Almost surely, 2^491309188 is an apocalyptic number.

It is an amenable number.

491309188 is a deficient number, since it is larger than the sum of its proper divisors (369251352).

491309188 is a wasteful number, since it uses less digits than its factorization.

491309188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109926 (or 109924 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 491309188 is about 22165.4954377293. The cubic root of 491309188 is about 789.0750205899.

The spelling of 491309188 in words is "four hundred ninety-one million, three hundred nine thousand, one hundred eighty-eight".