243415121 has 2 divisors, whose sum is σ = 243415122. Its totient is φ = 243415120.

The previous prime is 243415111. The next prime is 243415147. The reversal of 243415121 is 121514342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204490000 + 38925121 = 14300^2 + 6239^2 .

It is a cyclic number.

It is not a de Polignac number, because 243415121 - 2¹⁸ = 243152977 is a prime.

It is a super-2 number, since 2×243415121² = 118501842262889282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243415111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121707560 + 121707561.

It is an arithmetic number, because the mean of its divisors is an integer number (121707561).

Almost surely, 2^243415121 is an apocalyptic number.

It is an amenable number.

243415121 is a deficient number, since it is larger than the sum of its proper divisors (1).

243415121 is an equidigital number, since it uses as much as digits as its factorization.

243415121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 23.

The square root of 243415121 is about 15601.7665986900. The cubic root of 243415121 is about 624.3802889896.

Adding to 243415121 its reverse (121514342), we get a palindrome (364929463).

The spelling of 243415121 in words is "two hundred forty-three million, four hundred fifteen thousand, one hundred twenty-one".