2159081 has 2 divisors, whose sum is σ = 2159082. Its totient is φ = 2159080.

The previous prime is 2159063. The next prime is 2159083. The reversal of 2159081 is 1809512.

It is a happy number.

2159081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2059225 + 99856 = 1435^2 + 316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2159081 is a prime.

It is a super-2 number, since 2×2159081² = 9323261529122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 2159083, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2159081.

It is not a weakly prime, because it can be changed into another prime (2159083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079540 + 1079541.

It is an arithmetic number, because the mean of its divisors is an integer number (1079541).

2^2159081 is an apocalyptic number.

It is an amenable number.

2159081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2159081 is an equidigital number, since it uses as much as digits as its factorization.

2159081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 2159081 is about 1469.3811622585. The cubic root of 2159081 is about 129.2477461580.

The spelling of 2159081 in words is "two million, one hundred fifty-nine thousand, eighty-one".