243405101 has 4 divisors (see below), whose sum is σ = 243842652. Its totient is φ = 242967552.

The previous prime is 243405079. The next prime is 243405103. The reversal of 243405101 is 101504342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 101504342 = 2 ⋅50752171.

It can be written as a sum of positive squares in 2 ways, for example, as 13912900 + 229492201 = 3730^2 + 15149^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243405101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243405103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217940 + ... + 219053.

It is an arithmetic number, because the mean of its divisors is an integer number (60960663).

Almost surely, 2^243405101 is an apocalyptic number.

It is an amenable number.

243405101 is a deficient number, since it is larger than the sum of its proper divisors (437551).

243405101 is an equidigital number, since it uses as much as digits as its factorization.

243405101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437550.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 243405101 is about 15601.4454779036. The cubic root of 243405101 is about 624.3717214907.

Adding to 243405101 its reverse (101504342), we get a palindrome (344909443).

The spelling of 243405101 in words is "two hundred forty-three million, four hundred five thousand, one hundred one".