2141681 has 2 divisors, whose sum is σ = 2141682. Its totient is φ = 2141680.

The previous prime is 2141669. The next prime is 2141687. The reversal of 2141681 is 1861412.

2141681 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., 1123600 + 1018081 = 1060^2 + 1009^2 .

It is a cyclic number.

It is not a de Polignac number, because 2141681 - 2⁶ = 2141617 is a prime.

It is a super-2 number, since 2×2141681² = 9173595011522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2141687) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1070840 + 1070841.

It is an arithmetic number, because the mean of its divisors is an integer number (1070841).

2^2141681 is an apocalyptic number.

It is an amenable number.

2141681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2141681 is an equidigital number, since it uses as much as digits as its factorization.

2141681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 23.

The square root of 2141681 is about 1463.4483250187. The cubic root of 2141681 is about 128.8996074067.

The spelling of 2141681 in words is "two million, one hundred forty-one thousand, six hundred eighty-one".