2061165121 has 2 divisors, whose sum is σ = 2061165122. Its totient is φ = 2061165120.

The previous prime is 2061165103. The next prime is 2061165133. The reversal of 2061165121 is 1215611602.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1932569521 + 128595600 = 43961^2 + 11340^2 .

It is a cyclic number.

It is not a de Polignac number, because 2061165121 - 2¹⁹ = 2060640833 is a prime.

It is not a weakly prime, because it can be changed into another prime (2061165181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1030582560 + 1030582561.

It is an arithmetic number, because the mean of its divisors is an integer number (1030582561).

Almost surely, 2^2061165121 is an apocalyptic number.

It is an amenable number.

2061165121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2061165121 is an equidigital number, since it uses as much as digits as its factorization.

2061165121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 2061165121 is about 45400.0563986434. The cubic root of 2061165121 is about 1272.6361678836.

Adding to 2061165121 its reverse (1215611602), we get a palindrome (3276776723).

The spelling of 2061165121 in words is "two billion, sixty-one million, one hundred sixty-five thousand, one hundred twenty-one".