243042101 has 2 divisors, whose sum is σ = 243042102. Its totient is φ = 243042100.

The previous prime is 243042097. The next prime is 243042103. The reversal of 243042101 is 101240342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 236359876 + 6682225 = 15374^2 + 2585^2 .

It is a cyclic number.

It is not a de Polignac number, because 243042101 - 2² = 243042097 is a prime.

Together with 243042103, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243042101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243042103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121521050 + 121521051.

It is an arithmetic number, because the mean of its divisors is an integer number (121521051).

Almost surely, 2^243042101 is an apocalyptic number.

It is an amenable number.

243042101 is a deficient number, since it is larger than the sum of its proper divisors (1).

243042101 is an equidigital number, since it uses as much as digits as its factorization.

243042101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 243042101 is about 15589.8075998391. The cubic root of 243042101 is about 624.0611833567.

Adding to 243042101 its reverse (101240342), we get a palindrome (344282443).

The spelling of 243042101 in words is "two hundred forty-three million, forty-two thousand, one hundred one".