243121413 has 16 divisors (see below), whose sum is σ = 344407680. Its totient is φ = 152260416.

The previous prime is 243121399. The next prime is 243121429. The reversal of 243121413 is 314121342.

It is not a de Polignac number, because 243121413 - 2⁹ = 243120901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243121413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243121453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34545 + ... + 40982.

It is an arithmetic number, because the mean of its divisors is an integer number (21525480).

Almost surely, 2^243121413 is an apocalyptic number.

It is an amenable number.

243121413 is a deficient number, since it is larger than the sum of its proper divisors (101286267).

243121413 is a wasteful number, since it uses less digits than its factorization.

243121413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75596.

The product of its digits is 576, while the sum is 21.

The square root of 243121413 is about 15592.3511055902. The cubic root of 243121413 is about 624.1290593302.

Adding to 243121413 its reverse (314121342), we get a palindrome (557242755).

The spelling of 243121413 in words is "two hundred forty-three million, one hundred twenty-one thousand, four hundred thirteen".