243101 has 2 divisors, whose sum is σ = 243102. Its totient is φ = 243100.

The previous prime is 243091. The next prime is 243109. The reversal of 243101 is 101342.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220900 + 22201 = 470^2 + 149^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243101 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121550 + 121551.

It is an arithmetic number, because the mean of its divisors is an integer number (121551).

2²⁴³¹⁰¹ is an apocalyptic number.

243101 is the 221-st centered decagonal number.

It is an amenable number.

243101 is a deficient number, since it is larger than the sum of its proper divisors (1).

243101 is an equidigital number, since it uses as much as digits as its factorization.

243101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 243101 is about 493.0527355162. The cubic root of 243101 is about 62.4111591099.

Adding to 243101 its reverse (101342), we get a palindrome (344443).

It can be divided in two parts, 24 and 3101, that added together give a 5-th power (3125 = 5⁵).

The spelling of 243101 in words is "two hundred forty-three thousand, one hundred one", and thus it is an iban number.