243442541 has 2 divisors, whose sum is σ = 243442542. Its totient is φ = 243442540.

The previous prime is 243442519. The next prime is 243442583. The reversal of 243442541 is 145244342.

243442541 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186213316 + 57229225 = 13646^2 + 7565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243442541 is a prime.

It is a super-3 number, since 3×243442541³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243442141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121721270 + 121721271.

It is an arithmetic number, because the mean of its divisors is an integer number (121721271).

Almost surely, 2^243442541 is an apocalyptic number.

It is an amenable number.

243442541 is a deficient number, since it is larger than the sum of its proper divisors (1).

243442541 is an equidigital number, since it uses as much as digits as its factorization.

243442541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15360, while the sum is 29.

The square root of 243442541 is about 15602.6453205859. The cubic root of 243442541 is about 624.4037329793.

Adding to 243442541 its reverse (145244342), we get a palindrome (388686883).

The spelling of 243442541 in words is "two hundred forty-three million, four hundred forty-two thousand, five hundred forty-one".