243342149 has 2 divisors, whose sum is σ = 243342150. Its totient is φ = 243342148.

The previous prime is 243342091. The next prime is 243342179. The reversal of 243342149 is 941243342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148669249 + 94672900 = 12193^2 + 9730^2 .

It is a cyclic number.

It is not a de Polignac number, because 243342149 - 2²⁰ = 242293573 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243342179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121671074 + 121671075.

It is an arithmetic number, because the mean of its divisors is an integer number (121671075).

Almost surely, 2^243342149 is an apocalyptic number.

It is an amenable number.

243342149 is a deficient number, since it is larger than the sum of its proper divisors (1).

243342149 is an equidigital number, since it uses as much as digits as its factorization.

243342149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 32.

The square root of 243342149 is about 15599.4278420716. The cubic root of 243342149 is about 624.3178896449.

The spelling of 243342149 in words is "two hundred forty-three million, three hundred forty-two thousand, one hundred forty-nine".