121541243 has 4 divisors (see below), whose sum is σ = 123834528. Its totient is φ = 119247960.

The previous prime is 121541209. The next prime is 121541249. The reversal of 121541243 is 342145121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121541243 - 2¹⁰ = 121540219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121541249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1146563 + ... + 1146668.

It is an arithmetic number, because the mean of its divisors is an integer number (30958632).

Almost surely, 2^121541243 is an apocalyptic number.

121541243 is a deficient number, since it is larger than the sum of its proper divisors (2293285).

121541243 is an equidigital number, since it uses as much as digits as its factorization.

121541243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2293284.

The product of its digits is 960, while the sum is 23.

The square root of 121541243 is about 11024.5745042609. The cubic root of 121541243 is about 495.3451227167.

Adding to 121541243 its reverse (342145121), we get a palindrome (463686364).

The spelling of 121541243 in words is "one hundred twenty-one million, five hundred forty-one thousand, two hundred forty-three".