491450000 has 60 divisors (see below), whose sum is σ = 1190275380. Its totient is φ = 196560000.

The previous prime is 491449997. The next prime is 491450009. The reversal of 491450000 is 54194.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 301230736 + 190219264 = 17356^2 + 13792^2 .

It is not an unprimeable number, because it can be changed into a prime (491450009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45086 + ... + 54914.

It is an arithmetic number, because the mean of its divisors is an integer number (19837923).

Almost surely, 2^491450000 is an apocalyptic number.

491450000 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491450000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (595137690).

491450000 is an abundant number, since it is smaller than the sum of its proper divisors (698825380).

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

491450000 is an frugal number, since it uses more digits than its factorization.

491450000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9862 (or 9836 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 491450000 is about 22168.6715885278. The cubic root of 491450000 is about 789.1503978480.

The spelling of 491450000 in words is "four hundred ninety-one million, four hundred fifty thousand".