6561017 has 2 divisors, whose sum is σ = 6561018. Its totient is φ = 6561016.

The previous prime is 6561013. The next prime is 6561019. The reversal of 6561017 is 7101656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4932841 + 1628176 = 2221^2 + 1276^2 .

It is a cyclic number.

It is not a de Polignac number, because 6561017 - 2² = 6561013 is a prime.

Together with 6561019, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6561011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3280508 + 3280509.

It is an arithmetic number, because the mean of its divisors is an integer number (3280509).

Almost surely, 2^6561017 is an apocalyptic number.

It is an amenable number.

6561017 is a deficient number, since it is larger than the sum of its proper divisors (1).

6561017 is an equidigital number, since it uses as much as digits as its factorization.

6561017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 6561017 is about 2561.4482231738. The cubic root of 6561017 is about 187.2077057637.

The spelling of 6561017 in words is "six million, five hundred sixty-one thousand, seventeen".