243340381 has 2 divisors, whose sum is σ = 243340382. Its totient is φ = 243340380.

The previous prime is 243340337. The next prime is 243340399. The reversal of 243340381 is 183043342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200647225 + 42693156 = 14165^2 + 6534^2 .

It is a cyclic number.

It is not a de Polignac number, because 243340381 - 2²⁷ = 109122653 is a prime.

It is a super-2 number, since 2×243340381² = 118429082050450322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243340081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121670190 + 121670191.

It is an arithmetic number, because the mean of its divisors is an integer number (121670191).

Almost surely, 2^243340381 is an apocalyptic number.

It is an amenable number.

243340381 is a deficient number, since it is larger than the sum of its proper divisors (1).

243340381 is an equidigital number, since it uses as much as digits as its factorization.

243340381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 243340381 is about 15599.3711732236. The cubic root of 243340381 is about 624.3163776494.

The spelling of 243340381 in words is "two hundred forty-three million, three hundred forty thousand, three hundred eighty-one".