2159771 has 2 divisors, whose sum is σ = 2159772. Its totient is φ = 2159770.

The previous prime is 2159767. The next prime is 2159779. The reversal of 2159771 is 1779512.

2159771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2159771 - 2² = 2159767 is a prime.

It is a super-2 number, since 2×2159771² = 9329221544882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2159779) 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, 1079885 + 1079886.

It is an arithmetic number, because the mean of its divisors is an integer number (1079886).

2^2159771 is an apocalyptic number.

2159771 is a deficient number, since it is larger than the sum of its proper divisors (1).

2159771 is an equidigital number, since it uses as much as digits as its factorization.

2159771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4410, while the sum is 32.

The square root of 2159771 is about 1469.6159362228. The cubic root of 2159771 is about 129.2615130410.

The spelling of 2159771 in words is "two million, one hundred fifty-nine thousand, seven hundred seventy-one".