243702989 has 2 divisors, whose sum is σ = 243702990. Its totient is φ = 243702988.

The previous prime is 243702961. The next prime is 243703039. The reversal of 243702989 is 989207342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 224850025 + 18852964 = 14995^2 + 4342^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243702989 is a prime.

It is a super-2 number, since 2×243702989² = 118782293695068242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243702929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121851494 + 121851495.

It is an arithmetic number, because the mean of its divisors is an integer number (121851495).

Almost surely, 2^243702989 is an apocalyptic number.

It is an amenable number.

243702989 is a deficient number, since it is larger than the sum of its proper divisors (1).

243702989 is an equidigital number, since it uses as much as digits as its factorization.

243702989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 243702989 is about 15610.9893664687. The cubic root of 243702989 is about 624.6263272477.

The spelling of 243702989 in words is "two hundred forty-three million, seven hundred two thousand, nine hundred eighty-nine".