491231520 has 192 divisors, whose sum is σ = 1851776640. Its totient is φ = 120904704.

The previous prime is 491231509. The next prime is 491231569. The reversal of 491231520 is 25132194.

491231520 is a `hidden beast` number, since 491 + 23 + 152 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 51787 + ... + 60533.

It is an arithmetic number, because the mean of its divisors is an integer number (9644670).

Almost surely, 2^491231520 is an apocalyptic number.

491231520 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 491231520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (925888320).

491231520 is an abundant number, since it is smaller than the sum of its proper divisors (1360545120).

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

491231520 is a wasteful number, since it uses less digits than its factorization.

491231520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8784 (or 8770 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 491231520 is about 22163.7433661374. The cubic root of 491231520 is about 789.0334384186.

The spelling of 491231520 in words is "four hundred ninety-one million, two hundred thirty-one thousand, five hundred twenty".