2681321 has 2 divisors, whose sum is σ = 2681322. Its totient is φ = 2681320.

The previous prime is 2681297. The next prime is 2681347. The reversal of 2681321 is 1231862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2446096 + 235225 = 1564^2 + 485^2 .

It is a cyclic number.

It is not a de Polignac number, because 2681321 - 2¹⁰ = 2680297 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2681381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1340660 + 1340661.

It is an arithmetic number, because the mean of its divisors is an integer number (1340661).

2^2681321 is an apocalyptic number.

It is an amenable number.

2681321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2681321 is an equidigital number, since it uses as much as digits as its factorization.

2681321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 23.

The square root of 2681321 is about 1637.4739692587. The cubic root of 2681321 is about 138.9258096571.

The spelling of 2681321 in words is "two million, six hundred eighty-one thousand, three hundred twenty-one".