243151409 has 2 divisors, whose sum is σ = 243151410. Its totient is φ = 243151408.

The previous prime is 243151319. The next prime is 243151411. The reversal of 243151409 is 904151342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 242487184 + 664225 = 15572^2 + 815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243151409 is a prime.

Together with 243151411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243151609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121575704 + 121575705.

It is an arithmetic number, because the mean of its divisors is an integer number (121575705).

Almost surely, 2^243151409 is an apocalyptic number.

It is an amenable number.

243151409 is a deficient number, since it is larger than the sum of its proper divisors (1).

243151409 is an equidigital number, since it uses as much as digits as its factorization.

243151409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 243151409 is about 15593.3129578034. The cubic root of 243151409 is about 624.1547263486.

The spelling of 243151409 in words is "two hundred forty-three million, one hundred fifty-one thousand, four hundred nine".