243420354461 has 2 divisors, whose sum is σ = 243420354462. Its totient is φ = 243420354460.

The previous prime is 243420354451. The next prime is 243420354467. The reversal of 243420354461 is 164453024342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157624086361 + 85796268100 = 397019^2 + 292910^2 .

It is a cyclic number.

It is not a de Polignac number, because 243420354461 - 2³⁰ = 242346612637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243420354467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121710177230 + 121710177231.

It is an arithmetic number, because the mean of its divisors is an integer number (121710177231).

Almost surely, 2^243420354461 is an apocalyptic number.

It is an amenable number.

243420354461 is a deficient number, since it is larger than the sum of its proper divisors (1).

243420354461 is an equidigital number, since it uses as much as digits as its factorization.

243420354461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 276480, while the sum is 38.

The spelling of 243420354461 in words is "two hundred forty-three billion, four hundred twenty million, three hundred fifty-four thousand, four hundred sixty-one".