243125554541 has 4 divisors (see below), whose sum is σ = 243731853084. Its totient is φ = 242519256000.

The previous prime is 243125554537. The next prime is 243125554579. The reversal of 243125554541 is 145455521342.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 145455521342 = 2 ⋅72727760671.

It can be written as a sum of positive squares in 2 ways, for example, as 180430402441 + 62695152100 = 424771^2 + 250390^2 .

It is a cyclic number.

It is not a de Polignac number, because 243125554541 - 2² = 243125554537 is a prime.

It is a super-2 number, since 2×243125554541² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243125554501) 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, 303148670 + ... + 303149471.

It is an arithmetic number, because the mean of its divisors is an integer number (60932963271).

Almost surely, 2^243125554541 is an apocalyptic number.

It is an amenable number.

243125554541 is a deficient number, since it is larger than the sum of its proper divisors (606298543).

243125554541 is an equidigital number, since it uses as much as digits as its factorization.

243125554541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606298542.

The product of its digits is 480000, while the sum is 41.

The spelling of 243125554541 in words is "two hundred forty-three billion, one hundred twenty-five million, five hundred fifty-four thousand, five hundred forty-one".