2131324009 has 2 divisors, whose sum is σ = 2131324010. Its totient is φ = 2131324008.

The previous prime is 2131324007. The next prime is 2131324037. The reversal of 2131324009 is 9004231312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1521234009 + 610090000 = 39003^2 + 24700^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131324009 - 2¹ = 2131324007 is a prime.

Together with 2131324007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2131324001) 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 as a sum of consecutive naturals, namely, 1065662004 + 1065662005.

It is an arithmetic number, because the mean of its divisors is an integer number (1065662005).

Almost surely, 2^2131324009 is an apocalyptic number.

It is an amenable number.

2131324009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131324009 is an equidigital number, since it uses as much as digits as its factorization.

2131324009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 2131324009 is about 46166.2648369998. The cubic root of 2131324009 is about 1286.9148897443.

The spelling of 2131324009 in words is "two billion, one hundred thirty-one million, three hundred twenty-four thousand, nine".