2678681 has 2 divisors, whose sum is σ = 2678682. Its totient is φ = 2678680.

The previous prime is 2678651. The next prime is 2678699. The reversal of 2678681 is 1868762.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1488400 + 1190281 = 1220^2 + 1091^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2678681 is a prime.

It is a super-2 number, since 2×2678681² = 14350663799522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2678651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1339340 + 1339341.

It is an arithmetic number, because the mean of its divisors is an integer number (1339341).

2^2678681 is an apocalyptic number.

It is an amenable number.

2678681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2678681 is an equidigital number, since it uses as much as digits as its factorization.

2678681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 38.

The square root of 2678681 is about 1636.6676510520. The cubic root of 2678681 is about 138.8801997290.

The spelling of 2678681 in words is "two million, six hundred seventy-eight thousand, six hundred eighty-one".