6781087 has 2 divisors, whose sum is σ = 6781088. Its totient is φ = 6781086.

The previous prime is 6781063. The next prime is 6781091. The reversal of 6781087 is 7801876.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6781087 - 2⁷ = 6780959 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6781007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3390543 + 3390544.

It is an arithmetic number, because the mean of its divisors is an integer number (3390544).

Almost surely, 2^6781087 is an apocalyptic number.

6781087 is a deficient number, since it is larger than the sum of its proper divisors (1).

6781087 is an equidigital number, since it uses as much as digits as its factorization.

6781087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 6781087 is about 2604.0520348104. The cubic root of 6781087 is about 189.2778403818.

The spelling of 6781087 in words is "six million, seven hundred eighty-one thousand, eighty-seven".