6481381 has 2 divisors, whose sum is σ = 6481382. Its totient is φ = 6481380.

The previous prime is 6481367. The next prime is 6481393. The reversal of 6481381 is 1831846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6477025 + 4356 = 2545^2 + 66^2 .

It is a cyclic number.

It is not a de Polignac number, because 6481381 - 2⁹ = 6480869 is a prime.

It is a super-2 number, since 2×6481381² = 84016599334322, 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 (6484381) 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, 3240690 + 3240691.

It is an arithmetic number, because the mean of its divisors is an integer number (3240691).

Almost surely, 2^6481381 is an apocalyptic number.

It is an amenable number.

6481381 is a deficient number, since it is larger than the sum of its proper divisors (1).

6481381 is an equidigital number, since it uses as much as digits as its factorization.

6481381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 31.

The square root of 6481381 is about 2545.8556518389. The cubic root of 6481381 is about 186.4471935155.

The spelling of 6481381 in words is "six million, four hundred eighty-one thousand, three hundred eighty-one".