491265330 has 128 divisors (see below), whose sum is σ = 1285632000. Its totient is φ = 119750400.

The previous prime is 491265319. The next prime is 491265331. The reversal of 491265330 is 33562194.

It is a junction number, because it is equal to n+sod(n) for n = 491265291 and 491265300.

It is not an unprimeable number, because it can be changed into a prime (491265331) 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 63 ways as a sum of consecutive naturals, for example, 2468571 + ... + 2468769.

It is an arithmetic number, because the mean of its divisors is an integer number (10044000).

Almost surely, 2^491265330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491265330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (642816000).

491265330 is an abundant number, since it is smaller than the sum of its proper divisors (794366670).

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

491265330 is a wasteful number, since it uses less digits than its factorization.

491265330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 491265330 is about 22164.5060851804. The cubic root of 491265330 is about 789.0515402758.

The spelling of 491265330 in words is "four hundred ninety-one million, two hundred sixty-five thousand, three hundred thirty".