234921209 has 2 divisors, whose sum is σ = 234921210. Its totient is φ = 234921208.

The previous prime is 234921151. The next prime is 234921217. The reversal of 234921209 is 902129432.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225600400 + 9320809 = 15020^2 + 3053^2 .

It is a cyclic number.

It is not a de Polignac number, because 234921209 - 2⁸ = 234920953 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (234921299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 117460604 + 117460605.

It is an arithmetic number, because the mean of its divisors is an integer number (117460605).

Almost surely, 2^234921209 is an apocalyptic number.

It is an amenable number.

234921209 is a deficient number, since it is larger than the sum of its proper divisors (1).

234921209 is an equidigital number, since it uses as much as digits as its factorization.

234921209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 234921209 is about 15327.1396222518. The cubic root of 234921209 is about 617.0316042326.

The spelling of 234921209 in words is "two hundred thirty-four million, nine hundred twenty-one thousand, two hundred nine".