243889153 has 4 divisors (see below), whose sum is σ = 244533040. Its totient is φ = 243245268.

The previous prime is 243889147. The next prime is 243889169. The reversal of 243889153 is 351988342.

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 a de Polignac number, because none of the positive numbers 2^k-243889153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243889133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321375 + ... + 322132.

It is an arithmetic number, because the mean of its divisors is an integer number (61133260).

Almost surely, 2^243889153 is an apocalyptic number.

It is an amenable number.

243889153 is a deficient number, since it is larger than the sum of its proper divisors (643887).

243889153 is an equidigital number, since it uses as much as digits as its factorization.

243889153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643886.

The product of its digits is 207360, while the sum is 43.

The square root of 243889153 is about 15616.9508227439. The cubic root of 243889153 is about 624.7853368400.

The spelling of 243889153 in words is "two hundred forty-three million, eight hundred eighty-nine thousand, one hundred fifty-three".