243130132009 has 4 divisors (see below), whose sum is σ = 247115871940. Its totient is φ = 239144392080.

The previous prime is 243130131997. The next prime is 243130132039. The reversal of 243130132009 is 900231031342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 900231031342 = 2 ⋅450115515671.

It can be written as a sum of positive squares in 2 ways, for example, as 89638563609 + 153491568400 = 299397^2 + 391780^2 .

It is a cyclic number.

It is not a de Polignac number, because 243130132009 - 2²⁷ = 242995914281 is a prime.

It is a super-2 number, since 2×243130132009² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243130132039) 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, 1992869874 + ... + 1992869995.

It is an arithmetic number, because the mean of its divisors is an integer number (61778967985).

Almost surely, 2^243130132009 is an apocalyptic number.

It is an amenable number.

243130132009 is a deficient number, since it is larger than the sum of its proper divisors (3985739931).

243130132009 is an equidigital number, since it uses as much as digits as its factorization.

243130132009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3985739930.

The product of its (nonzero) digits is 3888, while the sum is 28.

The spelling of 243130132009 in words is "two hundred forty-three billion, one hundred thirty million, one hundred thirty-two thousand, nine".