6348781 has 2 divisors, whose sum is σ = 6348782. Its totient is φ = 6348780.

The previous prime is 6348773. The next prime is 6348787. The reversal of 6348781 is 1878436.

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., 5522500 + 826281 = 2350^2 + 909^2 .

It is a cyclic number.

It is not a de Polignac number, because 6348781 - 2³ = 6348773 is a prime.

It is a super-2 number, since 2×6348781² = 80614040371922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6348781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6348787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3174390 + 3174391.

It is an arithmetic number, because the mean of its divisors is an integer number (3174391).

Almost surely, 2^6348781 is an apocalyptic number.

It is an amenable number.

6348781 is a deficient number, since it is larger than the sum of its proper divisors (1).

6348781 is an equidigital number, since it uses as much as digits as its factorization.

6348781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 6348781 is about 2519.6787493647. The cubic root of 6348781 is about 185.1669396459.

The spelling of 6348781 in words is "six million, three hundred forty-eight thousand, seven hundred eighty-one".