6780551 has 2 divisors, whose sum is σ = 6780552. Its totient is φ = 6780550.

The previous prime is 6780517. The next prime is 6780581. The reversal of 6780551 is 1550876.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6780551 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6780581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3390275 + 3390276.

It is an arithmetic number, because the mean of its divisors is an integer number (3390276).

Almost surely, 2^6780551 is an apocalyptic number.

6780551 is a deficient number, since it is larger than the sum of its proper divisors (1).

6780551 is an equidigital number, since it uses as much as digits as its factorization.

6780551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 6780551 is about 2603.9491162463. The cubic root of 6780551 is about 189.2728531973.

The spelling of 6780551 in words is "six million, seven hundred eighty thousand, five hundred fifty-one".