6634561 has 2 divisors, whose sum is σ = 6634562. Its totient is φ = 6634560.

The previous prime is 6634559. The next prime is 6634571. The reversal of 6634561 is 1654366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5382400 + 1252161 = 2320^2 + 1119^2 .

It is a cyclic number.

It is not a de Polignac number, because 6634561 - 2¹ = 6634559 is a prime.

Together with 6634559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6634531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3317280 + 3317281.

It is an arithmetic number, because the mean of its divisors is an integer number (3317281).

Almost surely, 2^6634561 is an apocalyptic number.

It is an amenable number.

6634561 is a deficient number, since it is larger than the sum of its proper divisors (1).

6634561 is an equidigital number, since it uses as much as digits as its factorization.

6634561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 31.

The square root of 6634561 is about 2575.7641584586. The cubic root of 6634561 is about 187.9045935861.

The spelling of 6634561 in words is "six million, six hundred thirty-four thousand, five hundred sixty-one".