243205153 has 4 divisors (see below), whose sum is σ = 249137028. Its totient is φ = 237273280.

The previous prime is 243205147. The next prime is 243205159. The reversal of 243205153 is 351502342.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (243205147) and next prime (243205159).

It can be written as a sum of positive squares in 2 ways, for example, as 10093329 + 233111824 = 3177^2 + 15268^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243205153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243205159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2965876 + ... + 2965957.

It is an arithmetic number, because the mean of its divisors is an integer number (62284257).

Almost surely, 2^243205153 is an apocalyptic number.

It is an amenable number.

243205153 is a deficient number, since it is larger than the sum of its proper divisors (5931875).

243205153 is an equidigital number, since it uses as much as digits as its factorization.

243205153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5931874.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 243205153 is about 15595.0361653957. The cubic root of 243205153 is about 624.2007088095.

Adding to 243205153 its reverse (351502342), we get a palindrome (594707495).

The spelling of 243205153 in words is "two hundred forty-three million, two hundred five thousand, one hundred fifty-three".