2163971 has 2 divisors, whose sum is σ = 2163972. Its totient is φ = 2163970.

The previous prime is 2163949. The next prime is 2163979. The reversal of 2163971 is 1793612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2163971 - 2¹⁰ = 2162947 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2163979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1081985 + 1081986.

It is an arithmetic number, because the mean of its divisors is an integer number (1081986).

2^2163971 is an apocalyptic number.

2163971 is a deficient number, since it is larger than the sum of its proper divisors (1).

2163971 is an equidigital number, since it uses as much as digits as its factorization.

2163971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 29.

The square root of 2163971 is about 1471.0441869638. The cubic root of 2163971 is about 129.3452482794.

The spelling of 2163971 in words is "two million, one hundred sixty-three thousand, nine hundred seventy-one".