243523121 has 16 divisors (see below), whose sum is σ = 258508800. Its totient is φ = 229027008.

The previous prime is 243523081. The next prime is 243523129. The reversal of 243523121 is 121325342.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243523121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243523129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 508160 + ... + 508638.

It is an arithmetic number, because the mean of its divisors is an integer number (16156800).

Almost surely, 2^243523121 is an apocalyptic number.

It is an amenable number.

243523121 is a deficient number, since it is larger than the sum of its proper divisors (14985679).

243523121 is a wasteful number, since it uses less digits than its factorization.

243523121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928.

The product of its digits is 1440, while the sum is 23.

The square root of 243523121 is about 15605.2273613684. The cubic root of 243523121 is about 624.4726183683.

Adding to 243523121 its reverse (121325342), we get a palindrome (364848463).

The spelling of 243523121 in words is "two hundred forty-three million, five hundred twenty-three thousand, one hundred twenty-one".