243121541401 has 8 divisors (see below), whose sum is σ = 243805503240. Its totient is φ = 242437882752.

The previous prime is 243121541339. The next prime is 243121541407. The reversal of 243121541401 is 104145121342.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 21750350400 + 221371191001 = 147480^2 + 470501^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243121541401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243121541401.

It is not an unprimeable number, because it can be changed into a prime (243121541407) 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 7 ways as a sum of consecutive naturals, for example, 1580941 + ... + 1727893.

It is an arithmetic number, because the mean of its divisors is an integer number (30475687905).

Almost surely, 2^243121541401 is an apocalyptic number.

It is an amenable number.

243121541401 is a deficient number, since it is larger than the sum of its proper divisors (683961839).

243121541401 is a wasteful number, since it uses less digits than its factorization.

243121541401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151595.

The product of its (nonzero) digits is 3840, while the sum is 28.

Adding to 243121541401 its reverse (104145121342), we get a palindrome (347266662743).

The spelling of 243121541401 in words is "two hundred forty-three billion, one hundred twenty-one million, five hundred forty-one thousand, four hundred one".