4243121 has 2 divisors, whose sum is σ = 4243122. Its totient is φ = 4243120.

The previous prime is 4243117. The next prime is 4243139. The reversal of 4243121 is 1213424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2283121 + 1960000 = 1511^2 + 1400^2 .

It is a cyclic number.

It is not a de Polignac number, because 4243121 - 2² = 4243117 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 4243121.

It is not a weakly prime, because it can be changed into another prime (4243181) 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, 2121560 + 2121561.

It is an arithmetic number, because the mean of its divisors is an integer number (2121561).

Almost surely, 2^4243121 is an apocalyptic number.

It is an amenable number.

4243121 is a deficient number, since it is larger than the sum of its proper divisors (1).

4243121 is an equidigital number, since it uses as much as digits as its factorization.

4243121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 17.

The square root of 4243121 is about 2059.8837345831. The cubic root of 4243121 is about 161.8931495777.

Adding to 4243121 its reverse (1213424), we get a palindrome (5456545).

The spelling of 4243121 in words is "four million, two hundred forty-three thousand, one hundred twenty-one".