243124381 has 2 divisors, whose sum is σ = 243124382. Its totient is φ = 243124380.

The previous prime is 243124379. The next prime is 243124397. The reversal of 243124381 is 183421342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144817156 + 98307225 = 12034^2 + 9915^2 .

It is a cyclic number.

It is not a de Polignac number, because 243124381 - 2¹ = 243124379 is a prime.

It is a super-2 number, since 2×243124381² = 118218929273266322, which contains 22 as substring.

Together with 243124379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243124481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121562190 + 121562191.

It is an arithmetic number, because the mean of its divisors is an integer number (121562191).

Almost surely, 2^243124381 is an apocalyptic number.

It is an amenable number.

243124381 is a deficient number, since it is larger than the sum of its proper divisors (1).

243124381 is an equidigital number, since it uses as much as digits as its factorization.

243124381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 28.

The square root of 243124381 is about 15592.4462801704. The cubic root of 243124381 is about 624.1315990866.

The spelling of 243124381 in words is "two hundred forty-three million, one hundred twenty-four thousand, three hundred eighty-one".