36505561 has 2 divisors, whose sum is σ = 36505562. Its totient is φ = 36505560.

The previous prime is 36505559. The next prime is 36505571. The reversal of 36505561 is 16550563.

36505561 is digitally balanced in base 2, 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., 31416025 + 5089536 = 5605^2 + 2256^2 .

It is a cyclic number.

It is not a de Polignac number, because 36505561 - 2¹ = 36505559 is a prime.

Together with 36505559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (36505571) 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, 18252780 + 18252781.

It is an arithmetic number, because the mean of its divisors is an integer number (18252781).

Almost surely, 2^36505561 is an apocalyptic number.

It is an amenable number.

36505561 is a deficient number, since it is larger than the sum of its proper divisors (1).

36505561 is an equidigital number, since it uses as much as digits as its factorization.

36505561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13500, while the sum is 31.

The square root of 36505561 is about 6041.9832009035. The cubic root of 36505561 is about 331.7312172310.

The spelling of 36505561 in words is "thirty-six million, five hundred five thousand, five hundred sixty-one".