2061522209 has 2 divisors, whose sum is σ = 2061522210. Its totient is φ = 2061522208.

The previous prime is 2061522109. The next prime is 2061522233. The reversal of 2061522209 is 9022251602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1644545809 + 416976400 = 40553^2 + 20420^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2061522209 is a prime.

It is not a weakly prime, because it can be changed into another prime (2061522259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1030761104 + 1030761105.

It is an arithmetic number, because the mean of its divisors is an integer number (1030761105).

Almost surely, 2^2061522209 is an apocalyptic number.

It is an amenable number.

2061522209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2061522209 is an equidigital number, since it uses as much as digits as its factorization.

2061522209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 2061522209 is about 45403.9889106673. The cubic root of 2061522209 is about 1272.7096565556.

It can be divided in two parts, 20615 and 22209, that added together give a palindrome (42824).

The spelling of 2061522209 in words is "two billion, sixty-one million, five hundred twenty-two thousand, two hundred nine".