243313493 has 2 divisors, whose sum is σ = 243313494. Its totient is φ = 243313492.

The previous prime is 243313471. The next prime is 243313531. The reversal of 243313493 is 394313342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159719044 + 83594449 = 12638^2 + 9143^2 .

It is a cyclic number.

It is not a de Polignac number, because 243313493 - 2²⁰ = 242264917 is a prime.

It is a super-2 number, since 2×243313493² = 118402911751722098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243313403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121656746 + 121656747.

It is an arithmetic number, because the mean of its divisors is an integer number (121656747).

Almost surely, 2^243313493 is an apocalyptic number.

It is an amenable number.

243313493 is a deficient number, since it is larger than the sum of its proper divisors (1).

243313493 is an equidigital number, since it uses as much as digits as its factorization.

243313493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 32.

The square root of 243313493 is about 15598.5093198036. The cubic root of 243313493 is about 624.2933821002.

The spelling of 243313493 in words is "two hundred forty-three million, three hundred thirteen thousand, four hundred ninety-three".