243121141 has 4 divisors (see below), whose sum is σ = 243357984. Its totient is φ = 242884300.

The previous prime is 243121139. The next prime is 243121213. The reversal of 243121141 is 141121342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243121141 - 2¹ = 243121139 is a prime.

It is a super-2 number, since 2×243121141² = 118215778402283762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243122141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116875 + ... + 118936.

It is an arithmetic number, because the mean of its divisors is an integer number (60839496).

Almost surely, 2^243121141 is an apocalyptic number.

It is an amenable number.

243121141 is a deficient number, since it is larger than the sum of its proper divisors (236843).

243121141 is a wasteful number, since it uses less digits than its factorization.

243121141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236842.

The product of its digits is 192, while the sum is 19.

The square root of 243121141 is about 15592.3423833624. The cubic root of 243121141 is about 624.1288265752.

Adding to 243121141 its reverse (141121342), we get a palindrome (384242483).

The spelling of 243121141 in words is "two hundred forty-three million, one hundred twenty-one thousand, one hundred forty-one".