491545236 has 96 divisors (see below), whose sum is σ = 1473067008. Its totient is φ = 123995520.

The previous prime is 491545231. The next prime is 491545237. The reversal of 491545236 is 632545194.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 491545194 and 491545203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491545231) 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 31 ways as a sum of consecutive naturals, for example, 15331 + ... + 34901.

It is an arithmetic number, because the mean of its divisors is an integer number (15344448).

Almost surely, 2^491545236 is an apocalyptic number.

491545236 is a gapful number since it is divisible by the number (46) 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 491545236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (736533504).

491545236 is an abundant number, since it is smaller than the sum of its proper divisors (981521772).

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

491545236 is a wasteful number, since it uses less digits than its factorization.

491545236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19621 (or 19619 counting only the distinct ones).

The product of its digits is 129600, while the sum is 39.

The square root of 491545236 is about 22170.8194706465. The cubic root of 491545236 is about 789.2013699192.

The spelling of 491545236 in words is "four hundred ninety-one million, five hundred forty-five thousand, two hundred thirty-six".