7687243009 has 2 divisors, whose sum is σ = 7687243010. Its totient is φ = 7687243008.

The previous prime is 7687243007. The next prime is 7687243033. The reversal of 7687243009 is 9003427867.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5913148609 + 1774094400 = 76897^2 + 42120^2 .

It is a cyclic number.

It is not a de Polignac number, because 7687243009 - 2¹ = 7687243007 is a prime.

Together with 7687243007, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 7687243009.

It is not a weakly prime, because it can be changed into another prime (7687243001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3843621504 + 3843621505.

It is an arithmetic number, because the mean of its divisors is an integer number (3843621505).

Almost surely, 2^7687243009 is an apocalyptic number.

It is an amenable number.

7687243009 is a deficient number, since it is larger than the sum of its proper divisors (1).

7687243009 is an equidigital number, since it uses as much as digits as its factorization.

7687243009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 46.

The square root of 7687243009 is about 87676.9240393389. The cubic root of 7687243009 is about 1973.5897005658.

The spelling of 7687243009 in words is "seven billion, six hundred eighty-seven million, two hundred forty-three thousand, nine".