243121245 has 16 divisors (see below), whose sum is σ = 409467840. Its totient is φ = 122840064.

The previous prime is 243121243. The next prime is 243121259. The reversal of 243121245 is 542121342.

It is not a de Polignac number, because 243121245 - 2¹ = 243121243 is a prime.

It is a super-4 number, since 4×243121245⁴ (a number of 35 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243121243) 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, 426244 + ... + 426813.

It is an arithmetic number, because the mean of its divisors is an integer number (25591740).

Almost surely, 2^243121245 is an apocalyptic number.

It is an amenable number.

243121245 is a deficient number, since it is larger than the sum of its proper divisors (166346595).

243121245 is a wasteful number, since it uses less digits than its factorization.

243121245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853084.

The product of its digits is 1920, while the sum is 24.

The square root of 243121245 is about 15592.3457183324. The cubic root of 243121245 is about 624.1289155698.

Adding to 243121245 its reverse (542121342), we get a palindrome (785242587).

The spelling of 243121245 in words is "two hundred forty-three million, one hundred twenty-one thousand, two hundred forty-five".