243221039 has 2 divisors, whose sum is σ = 243221040. Its totient is φ = 243221038.

The previous prime is 243221003. The next prime is 243221047. The reversal of 243221039 is 930122342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243221039 - 2¹⁶ = 243155503 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243220999 and 243221017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243221339) 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, 121610519 + 121610520.

It is an arithmetic number, because the mean of its divisors is an integer number (121610520).

Almost surely, 2^243221039 is an apocalyptic number.

243221039 is a deficient number, since it is larger than the sum of its proper divisors (1).

243221039 is an equidigital number, since it uses as much as digits as its factorization.

243221039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 243221039 is about 15595.5454858110. The cubic root of 243221039 is about 624.2142993063.

The spelling of 243221039 in words is "two hundred forty-three million, two hundred twenty-one thousand, thirty-nine".