243011253 has 4 divisors (see below), whose sum is σ = 324015008. Its totient is φ = 162007500.

The previous prime is 243011221. The next prime is 243011267. The reversal of 243011253 is 352110342.

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 not a de Polignac number, because 243011253 - 2⁵ = 243011221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243011053) 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, 40501873 + ... + 40501878.

It is an arithmetic number, because the mean of its divisors is an integer number (81003752).

Almost surely, 2^243011253 is an apocalyptic number.

It is an amenable number.

243011253 is a deficient number, since it is larger than the sum of its proper divisors (81003755).

243011253 is an equidigital number, since it uses as much as digits as its factorization.

243011253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81003754.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 243011253 is about 15588.8182040846. The cubic root of 243011253 is about 624.0347793526.

Adding to 243011253 its reverse (352110342), we get a palindrome (595121595).

The spelling of 243011253 in words is "two hundred forty-three million, eleven thousand, two hundred fifty-three".