491169880 has 16 divisors (see below), whose sum is σ = 1105132320. Its totient is φ = 196467936.

The previous prime is 491169871. The next prime is 491169883. The reversal of 491169880 is 88961194.

It is a self number, because there is not a number n which added to its sum of digits gives 491169880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491169883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6139584 + ... + 6139663.

It is an arithmetic number, because the mean of its divisors is an integer number (69070770).

Almost surely, 2^491169880 is an apocalyptic number.

491169880 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491169880 is an abundant number, since it is smaller than the sum of its proper divisors (613962440).

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

491169880 is a wasteful number, since it uses less digits than its factorization.

491169880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12279258 (or 12279254 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 491169880 is about 22162.3527631883. The cubic root of 491169880 is about 789.0004342555. Note that the first 3 decimals are identical.

It can be divided in two parts, 49116 and 9880, that added together give a triangular number (58996 = T₃₄₃).

The spelling of 491169880 in words is "four hundred ninety-one million, one hundred sixty-nine thousand, eight hundred eighty".