2165261341 has 2 divisors, whose sum is σ = 2165261342. Its totient is φ = 2165261340.

The previous prime is 2165261297. The next prime is 2165261353. The reversal of 2165261341 is 1431625612.

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., 2064339225 + 100922116 = 45435^2 + 10046^2 .

It is a cyclic number.

It is not a de Polignac number, because 2165261341 - 2⁷ = 2165261213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2165261041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082630670 + 1082630671.

It is an arithmetic number, because the mean of its divisors is an integer number (1082630671).

Almost surely, 2^2165261341 is an apocalyptic number.

It is an amenable number.

2165261341 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165261341 is an equidigital number, since it uses as much as digits as its factorization.

2165261341 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 2165261341 is about 46532.3687447781. The cubic root of 2165261341 is about 1293.7095199949.

Adding to 2165261341 its reverse (1431625612), we get a palindrome (3596886953).

The spelling of 2165261341 in words is "two billion, one hundred sixty-five million, two hundred sixty-one thousand, three hundred forty-one".