491209524 has 72 divisors (see below), whose sum is σ = 1356106752. Its totient is φ = 149002560.

The previous prime is 491209507. The next prime is 491209529. The reversal of 491209524 is 425902194.

491209524 is a `hidden beast` number, since 4 + 9 + 120 + 9 + 524 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491209529) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25837 + ... + 40619.

It is an arithmetic number, because the mean of its divisors is an integer number (18834816).

Almost surely, 2^491209524 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 491209524, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (678053376).

491209524 is an abundant number, since it is smaller than the sum of its proper divisors (864897228).

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

491209524 is a wasteful number, since it uses less digits than its factorization.

491209524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14877 (or 14872 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 491209524 is about 22163.2471447665. The cubic root of 491209524 is about 789.0216613251.

The spelling of 491209524 in words is "four hundred ninety-one million, two hundred nine thousand, five hundred twenty-four".