243115516 has 48 divisors (see below), whose sum is σ = 505128960. Its totient is φ = 100186560.

The previous prime is 243115513. The next prime is 243115529. The reversal of 243115516 is 615511342.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243115511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149355 + ... + 150973.

It is an arithmetic number, because the mean of its divisors is an integer number (10523520).

Almost surely, 2^243115516 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 243115516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252564480).

243115516 is an abundant number, since it is smaller than the sum of its proper divisors (262013444).

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

243115516 is a wasteful number, since it uses less digits than its factorization.

243115516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1834 (or 1832 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 243115516 is about 15592.1620053154. The cubic root of 243115516 is about 624.1240131288.

Adding to 243115516 its reverse (615511342), we get a palindrome (858626858).

The spelling of 243115516 in words is "two hundred forty-three million, one hundred fifteen thousand, five hundred sixteen".