6781493 has 2 divisors, whose sum is σ = 6781494. Its totient is φ = 6781492.

The previous prime is 6781457. The next prime is 6781501. The reversal of 6781493 is 3941876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3602404 + 3179089 = 1898^2 + 1783^2 .

It is a cyclic number.

It is not a de Polignac number, because 6781493 - 2¹⁶ = 6715957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6781433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3390746 + 3390747.

It is an arithmetic number, because the mean of its divisors is an integer number (3390747).

Almost surely, 2^6781493 is an apocalyptic number.

It is an amenable number.

6781493 is a deficient number, since it is larger than the sum of its proper divisors (1).

6781493 is an equidigital number, since it uses as much as digits as its factorization.

6781493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 6781493 is about 2604.1299890750. The cubic root of 6781493 is about 189.2816178130.

The spelling of 6781493 in words is "six million, seven hundred eighty-one thousand, four hundred ninety-three".