7721441009 has 2 divisors, whose sum is σ = 7721441010. Its totient is φ = 7721441008.

The previous prime is 7721441003. The next prime is 7721441017. The reversal of 7721441009 is 9001441277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5414752225 + 2306688784 = 73585^2 + 48028^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7721441009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7721441009.

It is not a weakly prime, because it can be changed into another prime (7721441003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3860720504 + 3860720505.

It is an arithmetic number, because the mean of its divisors is an integer number (3860720505).

Almost surely, 2^7721441009 is an apocalyptic number.

It is an amenable number.

7721441009 is a deficient number, since it is larger than the sum of its proper divisors (1).

7721441009 is an equidigital number, since it uses as much as digits as its factorization.

7721441009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 7721441009 is about 87871.7304313509. The cubic root of 7721441009 is about 1976.5119872131.

The spelling of 7721441009 in words is "seven billion, seven hundred twenty-one million, four hundred forty-one thousand, nine".