2165659 has 2 divisors, whose sum is σ = 2165660. Its totient is φ = 2165658.

The previous prime is 2165651. The next prime is 2165663. The reversal of 2165659 is 9565612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2165659 - 2³ = 2165651 is a prime.

2165659 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2165651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082829 + 1082830.

It is an arithmetic number, because the mean of its divisors is an integer number (1082830).

2^2165659 is an apocalyptic number.

2165659 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165659 is an equidigital number, since it uses as much as digits as its factorization.

2165659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 34.

The square root of 2165659 is about 1471.6178172338. The cubic root of 2165659 is about 129.3788713475.

The spelling of 2165659 in words is "two million, one hundred sixty-five thousand, six hundred fifty-nine".