6480781 has 2 divisors, whose sum is σ = 6480782. Its totient is φ = 6480780.

The previous prime is 6480751. The next prime is 6480811. The reversal of 6480781 is 1870846.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (6480751) and next prime (6480811).

It can be written as a sum of positive squares in only one way, i.e., 5248681 + 1232100 = 2291^2 + 1110^2 .

It is a cyclic number.

It is not a de Polignac number, because 6480781 - 2⁹ = 6480269 is a prime.

It is a super-2 number, since 2×6480781² = 84001044739922, which contains 22 as substring.

6480781 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6480751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3240390 + 3240391.

It is an arithmetic number, because the mean of its divisors is an integer number (3240391).

Almost surely, 2^6480781 is an apocalyptic number.

It is an amenable number.

6480781 is a deficient number, since it is larger than the sum of its proper divisors (1).

6480781 is an equidigital number, since it uses as much as digits as its factorization.

6480781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 6480781 is about 2545.7378105374. The cubic root of 6480781 is about 186.4414400211.

The spelling of 6480781 in words is "six million, four hundred eighty thousand, seven hundred eighty-one".