243572993 has 2 divisors, whose sum is σ = 243572994. Its totient is φ = 243572992.

The previous prime is 243572977. The next prime is 243573017. The reversal of 243572993 is 399275342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 239382784 + 4190209 = 15472^2 + 2047^2 .

It is a cyclic number.

It is not a de Polignac number, because 243572993 - 2⁴ = 243572977 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243572933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121786496 + 121786497.

It is an arithmetic number, because the mean of its divisors is an integer number (121786497).

Almost surely, 2^243572993 is an apocalyptic number.

It is an amenable number.

243572993 is a deficient number, since it is larger than the sum of its proper divisors (1).

243572993 is an equidigital number, since it uses as much as digits as its factorization.

243572993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 44.

The square root of 243572993 is about 15606.8252056592. The cubic root of 243572993 is about 624.5152448104.

The spelling of 243572993 in words is "two hundred forty-three million, five hundred seventy-two thousand, nine hundred ninety-three".