6511961 has 2 divisors, whose sum is σ = 6511962. Its totient is φ = 6511960.

The previous prime is 6511937. The next prime is 6511997. The reversal of 6511961 is 1691156.

6511961 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5175625 + 1336336 = 2275^2 + 1156^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6511961 is a prime.

It is not a weakly prime, because it can be changed into another prime (6411961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3255980 + 3255981.

It is an arithmetic number, because the mean of its divisors is an integer number (3255981).

Almost surely, 2^6511961 is an apocalyptic number.

It is an amenable number.

6511961 is a deficient number, since it is larger than the sum of its proper divisors (1).

6511961 is an equidigital number, since it uses as much as digits as its factorization.

6511961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 29.

The square root of 6511961 is about 2551.8544237476. The cubic root of 6511961 is about 186.7399609424.

The spelling of 6511961 in words is "six million, five hundred eleven thousand, nine hundred sixty-one".