491551700 has 36 divisors (see below), whose sum is σ = 1072236060. Its totient is φ = 195594240.

The previous prime is 491551663. The next prime is 491551727. The reversal of 491551700 is 7155194.

It can be written as a sum of positive squares in 6 ways, for example, as 7639696 + 483912004 = 2764^2 + 21998^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6566 + ... + 32034.

It is an arithmetic number, because the mean of its divisors is an integer number (29784335).

Almost surely, 2^491551700 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491551700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (536118030).

491551700 is an abundant number, since it is smaller than the sum of its proper divisors (580684360).

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

491551700 is a wasteful number, since it uses less digits than its factorization.

491551700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25676 (or 25669 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 32.

The square root of 491551700 is about 22170.9652473680. The cubic root of 491551700 is about 789.2048293331.

The spelling of 491551700 in words is "four hundred ninety-one million, five hundred fifty-one thousand, seven hundred".