243038869 has 2 divisors, whose sum is σ = 243038870. Its totient is φ = 243038868.

The previous prime is 243038863. The next prime is 243038897. The reversal of 243038869 is 968830342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217415025 + 25623844 = 14745^2 + 5062^2 .

It is a cyclic number.

It is not a de Polignac number, because 243038869 - 2²³ = 234650261 is a prime.

It is a super-2 number, since 2×243038869² = 118135783689598322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243038863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121519434 + 121519435.

It is an arithmetic number, because the mean of its divisors is an integer number (121519435).

Almost surely, 2^243038869 is an apocalyptic number.

It is an amenable number.

243038869 is a deficient number, since it is larger than the sum of its proper divisors (1).

243038869 is an equidigital number, since it uses as much as digits as its factorization.

243038869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 43.

The square root of 243038869 is about 15589.7039420253. The cubic root of 243038869 is about 624.0584170669.

The spelling of 243038869 in words is "two hundred forty-three million, thirty-eight thousand, eight hundred sixty-nine".