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491536 = 2431991
BaseRepresentation
bin1111000000000010000
3220222021001
41320000100
5111212121
614311344
74115023
oct1700020
9828231
10491536
11306331
121b8554
13142966
14cb1ba
159a991
hex78010

491536 has 20 divisors (see below), whose sum is σ = 984064. Its totient is φ = 237600.

The previous prime is 491531. The next prime is 491537. The reversal of 491536 is 635194.

491536 is a nontrivial binomial coefficient, being equal to C(992, 2).

491536 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 991.

2491536 is an apocalyptic number.

491536 is the 991-st triangular number and also the 496-th hexagonal number.

491536 is the 331-st centered nonagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (492032).

491536 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

491536 is a wasteful number, since it uses less digits than its factorization.

491536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030 (or 1024 counting only the distinct ones).

The product of its digits is 3240, while the sum is 28.

The square root of 491536 is about 701.0962844004. The cubic root of 491536 is about 78.9196426929.

The spelling of 491536 in words is "four hundred ninety-one thousand, five hundred thirty-six".