2621445209 has 2 divisors, whose sum is σ = 2621445210. Its totient is φ = 2621445208.

The previous prime is 2621445193. The next prime is 2621445241. The reversal of 2621445209 is 9025441262.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2122905625 + 498539584 = 46075^2 + 22328^2 .

It is a cyclic number.

It is not a de Polignac number, because 2621445209 - 2⁴ = 2621445193 is a prime.

It is not a weakly prime, because it can be changed into another prime (2621445289) 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, 1310722604 + 1310722605.

It is an arithmetic number, because the mean of its divisors is an integer number (1310722605).

Almost surely, 2^2621445209 is an apocalyptic number.

It is an amenable number.

2621445209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2621445209 is an equidigital number, since it uses as much as digits as its factorization.

2621445209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 2621445209 is about 51200.0508691154. The cubic root of 2621445209 is about 1378.8391149051.

The spelling of 2621445209 in words is "two billion, six hundred twenty-one million, four hundred forty-five thousand, two hundred nine".