2801681 has 2 divisors, whose sum is σ = 2801682. Its totient is φ = 2801680.

The previous prime is 2801641. The next prime is 2801693. The reversal of 2801681 is 1861082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2531281 + 270400 = 1591^2 + 520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2801681 is a prime.

It is a super-2 number, since 2×2801681² = 15698832851522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2801681.

It is not a weakly prime, because it can be changed into another prime (2801611) 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, 1400840 + 1400841.

It is an arithmetic number, because the mean of its divisors is an integer number (1400841).

2^2801681 is an apocalyptic number.

It is an amenable number.

2801681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2801681 is an equidigital number, since it uses as much as digits as its factorization.

2801681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 2801681 is about 1673.8222725248. The cubic root of 2801681 is about 140.9741749728.

The spelling of 2801681 in words is "two million, eight hundred one thousand, six hundred eighty-one".