243136553 has 6 divisors (see below), whose sum is σ = 267249402. Its totient is φ = 221033120.

The previous prime is 243136549. The next prime is 243136573. The reversal of 243136553 is 355631342.

It can be written as a sum of positive squares in only one way, i.e., 203547289 + 39589264 = 14267^2 + 6292^2 .

It is not a de Polignac number, because 243136553 - 2² = 243136549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243136573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1004576 + ... + 1004817.

It is an arithmetic number, because the mean of its divisors is an integer number (44541567).

Almost surely, 2^243136553 is an apocalyptic number.

It is an amenable number.

243136553 is a deficient number, since it is larger than the sum of its proper divisors (24112849).

243136553 is a wasteful number, since it uses less digits than its factorization.

243136553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2009415 (or 2009404 counting only the distinct ones).

The product of its digits is 32400, while the sum is 32.

The square root of 243136553 is about 15592.8365924869. The cubic root of 243136553 is about 624.1420146100.

Adding to 243136553 its reverse (355631342), we get a palindrome (598767895).

The spelling of 243136553 in words is "two hundred forty-three million, one hundred thirty-six thousand, five hundred fifty-three".