6744781 has 2 divisors, whose sum is σ = 6744782. Its totient is φ = 6744780.

The previous prime is 6744779. The next prime is 6744817. The reversal of 6744781 is 1874476.

6744781 = T₂₁₁₉ + T₂₁₂₀ + T₂₁₂₁.

Together with next prime (6744817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4583881 + 2160900 = 2141^2 + 1470^2 .

It is a cyclic number.

It is not a de Polignac number, because 6744781 - 2¹ = 6744779 is a prime.

It is a super-2 number, since 2×6744781² = 90984141475922, which contains 22 as substring.

Together with 6744779, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 6744781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6744181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3372390 + 3372391.

It is an arithmetic number, because the mean of its divisors is an integer number (3372391).

Almost surely, 2^6744781 is an apocalyptic number.

6744781 is the 2121-st centered triangular number.

It is an amenable number.

6744781 is a deficient number, since it is larger than the sum of its proper divisors (1).

6744781 is an equidigital number, since it uses as much as digits as its factorization.

6744781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37632, while the sum is 37.

The square root of 6744781 is about 2597.0716201137. The cubic root of 6744781 is about 188.9394373110.

It can be divided in two parts, 67447 and 81, that added together give a triangular number (67528 = T₃₆₇).

The spelling of 6744781 in words is "six million, seven hundred forty-four thousand, seven hundred eighty-one".