491169020 has 48 divisors (see below), whose sum is σ = 1054021248. Its totient is φ = 192192000.

The previous prime is 491168999. The next prime is 491169037. The reversal of 491169020 is 20961194.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 653645 + ... + 654395.

It is an arithmetic number, because the mean of its divisors is an integer number (21958776).

Almost surely, 2^491169020 is an apocalyptic number.

It is an amenable number.

491169020 is an abundant number, since it is smaller than the sum of its proper divisors (562852228).

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

491169020 is a wasteful number, since it uses less digits than its factorization.

491169020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1430 (or 1428 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 491169020 is about 22162.3333609076. Note that the first 4 decimals coincide. The cubic root of 491169020 is about 788.9999737626. Note that the first 4 decimals are identical.

The spelling of 491169020 in words is "four hundred ninety-one million, one hundred sixty-nine thousand, twenty".