6555961 has 2 divisors, whose sum is σ = 6555962. Its totient is φ = 6555960.

The previous prime is 6555959. The next prime is 6555971. The reversal of 6555961 is 1695556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6125625 + 430336 = 2475^2 + 656^2 .

It is a cyclic number.

It is not a de Polignac number, because 6555961 - 2¹ = 6555959 is a prime.

Together with 6555959, it forms a pair of twin primes.

6555961 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6555961.

It is not a weakly prime, because it can be changed into another prime (6555971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3277980 + 3277981.

It is an arithmetic number, because the mean of its divisors is an integer number (3277981).

Almost surely, 2^6555961 is an apocalyptic number.

It is an amenable number.

6555961 is a deficient number, since it is larger than the sum of its proper divisors (1).

6555961 is an equidigital number, since it uses as much as digits as its factorization.

6555961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40500, while the sum is 37.

The square root of 6555961 is about 2560.4610912881. The cubic root of 6555961 is about 187.1596052229.

The spelling of 6555961 in words is "six million, five hundred fifty-five thousand, nine hundred sixty-one".