2165059081 has 2 divisors, whose sum is σ = 2165059082. Its totient is φ = 2165059080.

The previous prime is 2165059049. The next prime is 2165059097. The reversal of 2165059081 is 1809505612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1498386681 + 666672400 = 38709^2 + 25820^2 .

It is a cyclic number.

It is not a de Polignac number, because 2165059081 - 2⁵ = 2165059049 is a prime.

It is a super-2 number, since 2×2165059081² = 9374961648441129122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2165059081.

It is not a weakly prime, because it can be changed into another prime (2165659081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082529540 + 1082529541.

It is an arithmetic number, because the mean of its divisors is an integer number (1082529541).

Almost surely, 2^2165059081 is an apocalyptic number.

It is an amenable number.

2165059081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165059081 is an equidigital number, since it uses as much as digits as its factorization.

2165059081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 2165059081 is about 46530.1953681693. The cubic root of 2165059081 is about 1293.6692363533.

The spelling of 2165059081 in words is "two billion, one hundred sixty-five million, fifty-nine thousand, eighty-one".