243734921 has 2 divisors, whose sum is σ = 243734922. Its totient is φ = 243734920.

The previous prime is 243734867. The next prime is 243734929. The reversal of 243734921 is 129437342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 222010000 + 21724921 = 14900^2 + 4661^2 .

It is a cyclic number.

It is not a de Polignac number, because 243734921 - 2⁶ = 243734857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243734929) 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, 121867460 + 121867461.

It is an arithmetic number, because the mean of its divisors is an integer number (121867461).

Almost surely, 2^243734921 is an apocalyptic number.

It is an amenable number.

243734921 is a deficient number, since it is larger than the sum of its proper divisors (1).

243734921 is an equidigital number, since it uses as much as digits as its factorization.

243734921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 35.

The square root of 243734921 is about 15612.0120740409. The cubic root of 243734921 is about 624.6536073082.

The spelling of 243734921 in words is "two hundred forty-three million, seven hundred thirty-four thousand, nine hundred twenty-one".