2129807509 has 2 divisors, whose sum is σ = 2129807510. Its totient is φ = 2129807508.

The previous prime is 2129807467. The next prime is 2129807513. The reversal of 2129807509 is 9057089212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2127976900 + 1830609 = 46130^2 + 1353^2 .

It is a cyclic number.

It is not a de Polignac number, because 2129807509 - 2⁹ = 2129806997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2129807599) 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, 1064903754 + 1064903755.

It is an arithmetic number, because the mean of its divisors is an integer number (1064903755).

Almost surely, 2^2129807509 is an apocalyptic number.

It is an amenable number.

2129807509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2129807509 is an equidigital number, since it uses as much as digits as its factorization.

2129807509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 2129807509 is about 46149.8375836795. The cubic root of 2129807509 is about 1286.6095913350.

The spelling of 2129807509 in words is "two billion, one hundred twenty-nine million, eight hundred seven thousand, five hundred nine".