6781281 has 32 divisors (see below), whose sum is σ = 10321920. Its totient is φ = 3931200.

The previous prime is 6781253. The next prime is 6781303. The reversal of 6781281 is 1821876.

It is a happy number.

It is not a de Polignac number, because 6781281 - 2⁷ = 6781153 is a prime.

It is a super-2 number, since 2×6781281² = 91971544001922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6781231) 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 in 31 ways as a sum of consecutive naturals, for example, 85800 + ... + 85878.

It is an arithmetic number, because the mean of its divisors is an integer number (322560).

Almost surely, 2^6781281 is an apocalyptic number.

It is an amenable number.

6781281 is a deficient number, since it is larger than the sum of its proper divisors (3540639).

6781281 is a wasteful number, since it uses less digits than its factorization.

6781281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197.

The product of its digits is 5376, while the sum is 33.

The square root of 6781281 is about 2604.0892841836. The cubic root of 6781281 is about 189.2796453800.

The spelling of 6781281 in words is "six million, seven hundred eighty-one thousand, two hundred eighty-one".