2681381 has 2 divisors, whose sum is σ = 2681382. Its totient is φ = 2681380.

The previous prime is 2681347. The next prime is 2681387. The reversal of 2681381 is 1831862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1809025 + 872356 = 1345^2 + 934^2 .

It is a cyclic number.

It is not a de Polignac number, because 2681381 - 2¹⁰ = 2680357 is a prime.

It is a super-2 number, since 2×2681381² = 14379608134322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2681387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1340690 + 1340691.

It is an arithmetic number, because the mean of its divisors is an integer number (1340691).

2^2681381 is an apocalyptic number.

It is an amenable number.

2681381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2681381 is an equidigital number, since it uses as much as digits as its factorization.

2681381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 29.

The square root of 2681381 is about 1637.4922900582. The cubic root of 2681381 is about 138.9268458984.

The spelling of 2681381 in words is "two million, six hundred eighty-one thousand, three hundred eighty-one".