243452901889 has 4 divisors (see below), whose sum is σ = 247579222320. Its totient is φ = 239326581460.

The previous prime is 243452901877. The next prime is 243452901911. The reversal of 243452901889 is 988109254342.

It is a happy number.

243452901889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243452901889 - 2¹⁹ = 243452377601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243452901859) 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 in 3 ways as a sum of consecutive naturals, for example, 2063160127 + ... + 2063160244.

It is an arithmetic number, because the mean of its divisors is an integer number (61894805580).

Almost surely, 2^243452901889 is an apocalyptic number.

It is an amenable number.

243452901889 is a deficient number, since it is larger than the sum of its proper divisors (4126320431).

243452901889 is an equidigital number, since it uses as much as digits as its factorization.

243452901889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4126320430.

The product of its (nonzero) digits is 4976640, while the sum is 55.

It can be divided in two parts, 243452 and 901889, that added together give a triangular number (1145341 = T₁₅₁₃).

The spelling of 243452901889 in words is "two hundred forty-three billion, four hundred fifty-two million, nine hundred one thousand, eight hundred eighty-nine".