243140121541 has 2 divisors, whose sum is σ = 243140121542. Its totient is φ = 243140121540.

The previous prime is 243140121461. The next prime is 243140121551. The reversal of 243140121541 is 145121041342.

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., 230875445025 + 12264676516 = 480495^2 + 110746^2 .

It is a cyclic number.

It is not a de Polignac number, because 243140121541 - 2²³ = 243131732933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243140121551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121570060770 + 121570060771.

It is an arithmetic number, because the mean of its divisors is an integer number (121570060771).

Almost surely, 2^243140121541 is an apocalyptic number.

It is an amenable number.

243140121541 is a deficient number, since it is larger than the sum of its proper divisors (1).

243140121541 is an equidigital number, since it uses as much as digits as its factorization.

243140121541 is an evil number, because the sum of its binary digits is even.

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

Adding to 243140121541 its reverse (145121041342), we get a palindrome (388261162883).

The spelling of 243140121541 in words is "two hundred forty-three billion, one hundred forty million, one hundred twenty-one thousand, five hundred forty-one".