243261439 has 2 divisors, whose sum is σ = 243261440. Its totient is φ = 243261438.

The previous prime is 243261413. The next prime is 243261451. The reversal of 243261439 is 934162342.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243261439 - 2⁷ = 243261311 is a prime.

It is a super-2 number, since 2×243261439² = 118352255408701442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243265439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121630719 + 121630720.

It is an arithmetic number, because the mean of its divisors is an integer number (121630720).

Almost surely, 2^243261439 is an apocalyptic number.

243261439 is a deficient number, since it is larger than the sum of its proper divisors (1).

243261439 is an equidigital number, since it uses as much as digits as its factorization.

243261439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 34.

The square root of 243261439 is about 15596.8406736749. The cubic root of 243261439 is about 624.2488589009.

The spelling of 243261439 in words is "two hundred forty-three million, two hundred sixty-one thousand, four hundred thirty-nine".