243045541 has 2 divisors, whose sum is σ = 243045542. Its totient is φ = 243045540.

The previous prime is 243045529. The next prime is 243045547. The reversal of 243045541 is 145540342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219484225 + 23561316 = 14815^2 + 4854^2 .

It is a cyclic number.

It is not a de Polignac number, because 243045541 - 2⁹ = 243045029 is a prime.

It is a super-2 number, since 2×243045541² = 118142269999965362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243045547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121522770 + 121522771.

It is an arithmetic number, because the mean of its divisors is an integer number (121522771).

Almost surely, 2^243045541 is an apocalyptic number.

It is an amenable number.

243045541 is a deficient number, since it is larger than the sum of its proper divisors (1).

243045541 is an equidigital number, since it uses as much as digits as its factorization.

243045541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 243045541 is about 15589.9179279430. The cubic root of 243045541 is about 624.0641276482.

Adding to 243045541 its reverse (145540342), we get a palindrome (388585883).

The spelling of 243045541 in words is "two hundred forty-three million, forty-five thousand, five hundred forty-one".