243125554501 has 2 divisors, whose sum is σ = 243125554502. Its totient is φ = 243125554500.

The previous prime is 243125554499. The next prime is 243125554537. The reversal of 243125554501 is 105455521342.

243125554501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210498357601 + 32627196900 = 458801^2 + 180630^2 .

It is a cyclic number.

It is not a de Polignac number, because 243125554501 - 2¹ = 243125554499 is a prime.

It is a super-2 number, since 2×243125554501² (a number of 24 digits) contains 22 as substring.

Together with 243125554499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243125554591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121562777250 + 121562777251.

It is an arithmetic number, because the mean of its divisors is an integer number (121562777251).

Almost surely, 2^243125554501 is an apocalyptic number.

It is an amenable number.

243125554501 is a deficient number, since it is larger than the sum of its proper divisors (1).

243125554501 is an equidigital number, since it uses as much as digits as its factorization.

243125554501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120000, while the sum is 37.

The spelling of 243125554501 in words is "two hundred forty-three billion, one hundred twenty-five million, five hundred fifty-four thousand, five hundred one".