53659561 has 2 divisors, whose sum is σ = 53659562. Its totient is φ = 53659560.

The previous prime is 53659559. The next prime is 53659579. The reversal of 53659561 is 16595635.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52649536 + 1010025 = 7256^2 + 1005^2 .

It is a cyclic number.

It is not a de Polignac number, because 53659561 - 2¹ = 53659559 is a prime.

Together with 53659559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (53659061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26829780 + 26829781.

It is an arithmetic number, because the mean of its divisors is an integer number (26829781).

Almost surely, 2^53659561 is an apocalyptic number.

It is an amenable number.

53659561 is a deficient number, since it is larger than the sum of its proper divisors (1).

53659561 is an equidigital number, since it uses as much as digits as its factorization.

53659561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 121500, while the sum is 40.

The square root of 53659561 is about 7325.2686640150. The cubic root of 53659561 is about 377.1803319858.

The spelling of 53659561 in words is "fifty-three million, six hundred fifty-nine thousand, five hundred sixty-one".