243531073 has 2 divisors, whose sum is σ = 243531074. Its totient is φ = 243531072.

The previous prime is 243531053. The next prime is 243531091. The reversal of 243531073 is 370135342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163123984 + 80407089 = 12772^2 + 8967^2 .

It is a cyclic number.

It is not a de Polignac number, because 243531073 - 2⁹ = 243530561 is a prime.

It is not a weakly prime, because it can be changed into another prime (243531053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121765536 + 121765537.

It is an arithmetic number, because the mean of its divisors is an integer number (121765537).

Almost surely, 2^243531073 is an apocalyptic number.

It is an amenable number.

243531073 is a deficient number, since it is larger than the sum of its proper divisors (1).

243531073 is an equidigital number, since it uses as much as digits as its factorization.

243531073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 28.

The square root of 243531073 is about 15605.4821457076. The cubic root of 243531073 is about 624.4794154672.

The spelling of 243531073 in words is "two hundred forty-three million, five hundred thirty-one thousand, seventy-three".