243409890259 has 2 divisors, whose sum is σ = 243409890260. Its totient is φ = 243409890258.

The previous prime is 243409890179. The next prime is 243409890287. The reversal of 243409890259 is 952098904342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243409890259 - 2⁹ = 243409889747 is a prime.

It is not a weakly prime, because it can be changed into another prime (243409896259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121704945129 + 121704945130.

It is an arithmetic number, because the mean of its divisors is an integer number (121704945130).

Almost surely, 2^243409890259 is an apocalyptic number.

243409890259 is a deficient number, since it is larger than the sum of its proper divisors (1).

243409890259 is an equidigital number, since it uses as much as digits as its factorization.

243409890259 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5598720, while the sum is 55.

The spelling of 243409890259 in words is "two hundred forty-three billion, four hundred nine million, eight hundred ninety thousand, two hundred fifty-nine".