243420354493 has 2 divisors, whose sum is σ = 243420354494. Its totient is φ = 243420354492.

The previous prime is 243420354467. The next prime is 243420354523. The reversal of 243420354493 is 394453024342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136584202329 + 106836152164 = 369573^2 + 326858^2 .

It is a cyclic number.

It is not a de Polignac number, because 243420354493 - 2⁵ = 243420354461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243420354413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121710177246 + 121710177247.

It is an arithmetic number, because the mean of its divisors is an integer number (121710177247).

Almost surely, 2^243420354493 is an apocalyptic number.

It is an amenable number.

243420354493 is a deficient number, since it is larger than the sum of its proper divisors (1).

243420354493 is an equidigital number, since it uses as much as digits as its factorization.

243420354493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 43.

The spelling of 243420354493 in words is "two hundred forty-three billion, four hundred twenty million, three hundred fifty-four thousand, four hundred ninety-three".