243044020253 has 4 divisors (see below), whose sum is σ = 248971923228. Its totient is φ = 237116117280.

The previous prime is 243044020237. The next prime is 243044020301. The reversal of 243044020253 is 352020440342.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 82882379449 + 160161640804 = 287893^2 + 400202^2 .

It is a cyclic number.

It is not a de Polignac number, because 243044020253 - 2⁴ = 243044020237 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 (243044520253) 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, 2963951426 + ... + 2963951507.

It is an arithmetic number, because the mean of its divisors is an integer number (62242980807).

Almost surely, 2^243044020253 is an apocalyptic number.

It is an amenable number.

243044020253 is a deficient number, since it is larger than the sum of its proper divisors (5927902975).

243044020253 is an equidigital number, since it uses as much as digits as its factorization.

243044020253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5927902974.

The product of its (nonzero) digits is 23040, while the sum is 29.

Adding to 243044020253 its reverse (352020440342), we get a palindrome (595064460595).

The spelling of 243044020253 in words is "two hundred forty-three billion, forty-four million, twenty thousand, two hundred fifty-three".