2621440009 has 2 divisors, whose sum is σ = 2621440010. Its totient is φ = 2621440008.

The previous prime is 2621439983. The next prime is 2621440027. The reversal of 2621440009 is 9000441262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2621440000 + 9 = 51200^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 2621440009 - 2⁹ = 2621439497 is a prime.

It is not a weakly prime, because it can be changed into another prime (2621440039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1310720004 + 1310720005.

It is an arithmetic number, because the mean of its divisors is an integer number (1310720005).

Almost surely, 2^2621440009 is an apocalyptic number.

It is an amenable number.

2621440009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2621440009 is an equidigital number, since it uses as much as digits as its factorization.

2621440009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 2621440009 is about 51200.0000878906. Note that the first 4 decimals coincide. The cubic root of 2621440009 is about 1378.8382031984.

The spelling of 2621440009 in words is "two billion, six hundred twenty-one million, four hundred forty thousand, nine".