2140681 has 2 divisors, whose sum is σ = 2140682. Its totient is φ = 2140680.

The previous prime is 2140637. The next prime is 2140729. The reversal of 2140681 is 1860412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2073600 + 67081 = 1440^2 + 259^2 .

It is a cyclic number.

It is not a de Polignac number, because 2140681 - 2⁹ = 2140169 is a prime.

It is a super-2 number, since 2×2140681² = 9165030287522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2140601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1070340 + 1070341.

It is an arithmetic number, because the mean of its divisors is an integer number (1070341).

2^2140681 is an apocalyptic number.

It is an amenable number.

2140681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2140681 is an equidigital number, since it uses as much as digits as its factorization.

2140681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 2140681 is about 1463.1066263263. The cubic root of 2140681 is about 128.8795422220.

The spelling of 2140681 in words is "two million, one hundred forty thousand, six hundred eighty-one".