6742781 has 2 divisors, whose sum is σ = 6742782. Its totient is φ = 6742780.

The previous prime is 6742763. The next prime is 6742783. The reversal of 6742781 is 1872476.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4368100 + 2374681 = 2090^2 + 1541^2 .

It is a cyclic number.

It is not a de Polignac number, because 6742781 - 2¹⁴ = 6726397 is a prime.

It is a super-2 number, since 2×6742781² = 90930191227922, which contains 22 as substring.

Together with 6742783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6742783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3371390 + 3371391.

It is an arithmetic number, because the mean of its divisors is an integer number (3371391).

Almost surely, 2^6742781 is an apocalyptic number.

It is an amenable number.

6742781 is a deficient number, since it is larger than the sum of its proper divisors (1).

6742781 is an equidigital number, since it uses as much as digits as its factorization.

6742781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18816, while the sum is 35.

The square root of 6742781 is about 2596.6865424999. The cubic root of 6742781 is about 188.9207603403.

The spelling of 6742781 in words is "six million, seven hundred forty-two thousand, seven hundred eighty-one".