2156171 has 2 divisors, whose sum is σ = 2156172. Its totient is φ = 2156170.

The previous prime is 2156159. The next prime is 2156183. The reversal of 2156171 is 1716512.

It is a balanced prime because it is at equal distance from previous prime (2156159) and next prime (2156183).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2156171 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2156111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078085 + 1078086.

It is an arithmetic number, because the mean of its divisors is an integer number (1078086).

2^2156171 is an apocalyptic number.

2156171 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156171 is an equidigital number, since it uses as much as digits as its factorization.

2156171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 420, while the sum is 23.

The square root of 2156171 is about 1468.3906156061. The cubic root of 2156171 is about 129.1896535341.

The spelling of 2156171 in words is "two million, one hundred fifty-six thousand, one hundred seventy-one".