243153121 has 2 divisors, whose sum is σ = 243153122. Its totient is φ = 243153120.

The previous prime is 243153109. The next prime is 243153143. The reversal of 243153121 is 121351342.

It is a happy number.

It is an a-pointer prime, because the next prime (243153143) can be obtained adding 243153121 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 241491600 + 1661521 = 15540^2 + 1289^2 .

It is a cyclic number.

It is not a de Polignac number, because 243153121 - 2¹⁷ = 243022049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243153092 and 243153101.

It is not a weakly prime, because it can be changed into another prime (243183121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121576560 + 121576561.

It is an arithmetic number, because the mean of its divisors is an integer number (121576561).

Almost surely, 2^243153121 is an apocalyptic number.

It is an amenable number.

243153121 is a deficient number, since it is larger than the sum of its proper divisors (1).

243153121 is an equidigital number, since it uses as much as digits as its factorization.

243153121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 22.

The square root of 243153121 is about 15593.3678530329. The cubic root of 243153121 is about 624.1561912115.

The spelling of 243153121 in words is "two hundred forty-three million, one hundred fifty-three thousand, one hundred twenty-one".