6365561 has 2 divisors, whose sum is σ = 6365562. Its totient is φ = 6365560.

The previous prime is 6365543. The next prime is 6365563. The reversal of 6365561 is 1655636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4818025 + 1547536 = 2195^2 + 1244^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6365561 is a prime.

Together with 6365563, 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 (6365563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3182780 + 3182781.

It is an arithmetic number, because the mean of its divisors is an integer number (3182781).

Almost surely, 2^6365561 is an apocalyptic number.

It is an amenable number.

6365561 is a deficient number, since it is larger than the sum of its proper divisors (1).

6365561 is an equidigital number, since it uses as much as digits as its factorization.

6365561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 32.

The square root of 6365561 is about 2523.0063416488. The cubic root of 6365561 is about 185.3299298784.

Subtracting from 6365561 its sum of digits (32), we obtain a square (6365529 = 2523²).

The spelling of 6365561 in words is "six million, three hundred sixty-five thousand, five hundred sixty-one".