1224189121 has 2 divisors, whose sum is σ = 1224189122. Its totient is φ = 1224189120.

The previous prime is 1224189103. The next prime is 1224189149. The reversal of 1224189121 is 1219814221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 787588096 + 436601025 = 28064^2 + 20895^2 .

It is a cyclic number.

It is not a de Polignac number, because 1224189121 - 2¹³ = 1224180929 is a prime.

It is not a weakly prime, because it can be changed into another prime (1224159121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612094560 + 612094561.

It is an arithmetic number, because the mean of its divisors is an integer number (612094561).

Almost surely, 2^1224189121 is an apocalyptic number.

It is an amenable number.

1224189121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1224189121 is an equidigital number, since it uses as much as digits as its factorization.

1224189121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 31.

The square root of 1224189121 is about 34988.4140966692. The cubic root of 1224189121 is about 1069.7513385545.

The spelling of 1224189121 in words is "one billion, two hundred twenty-four million, one hundred eighty-nine thousand, one hundred twenty-one".