2183681 has 2 divisors, whose sum is σ = 2183682. Its totient is φ = 2183680.

The previous prime is 2183663. The next prime is 2183683. The reversal of 2183681 is 1863812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2016400 + 167281 = 1420^2 + 409^2 .

It is a cyclic number.

It is not a de Polignac number, because 2183681 - 2¹⁰ = 2182657 is a prime.

It is a super-2 number, since 2×2183681² = 9536925419522, which contains 22 as substring.

Together with 2183683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2183683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1091840 + 1091841.

It is an arithmetic number, because the mean of its divisors is an integer number (1091841).

2^2183681 is an apocalyptic number.

It is an amenable number.

2183681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2183681 is an equidigital number, since it uses as much as digits as its factorization.

2183681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 29.

The square root of 2183681 is about 1477.7283241516. The cubic root of 2183681 is about 129.7367651703.

The spelling of 2183681 in words is "two million, one hundred eighty-three thousand, six hundred eighty-one".