243031193 has 2 divisors, whose sum is σ = 243031194. Its totient is φ = 243031192.

The previous prime is 243031189. The next prime is 243031237. The reversal of 243031193 is 391130342.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193989184 + 49042009 = 13928^2 + 7003^2 .

It is a cyclic number.

It is not a de Polignac number, because 243031193 - 2² = 243031189 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 (243031163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121515596 + 121515597.

It is an arithmetic number, because the mean of its divisors is an integer number (121515597).

Almost surely, 2^243031193 is an apocalyptic number.

It is an amenable number.

243031193 is a deficient number, since it is larger than the sum of its proper divisors (1).

243031193 is an equidigital number, since it uses as much as digits as its factorization.

243031193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 243031193 is about 15589.4577519553. The cubic root of 243031193 is about 624.0518470302.

The spelling of 243031193 in words is "two hundred forty-three million, thirty-one thousand, one hundred ninety-three".