52661561 has 2 divisors, whose sum is σ = 52661562. Its totient is φ = 52661560.

The previous prime is 52661509. The next prime is 52661579. The reversal of 52661561 is 16516625.

52661561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52113961 + 547600 = 7219^2 + 740^2 .

It is a cyclic number.

It is not a de Polignac number, because 52661561 - 2²² = 48467257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (52660561) 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, 26330780 + 26330781.

It is an arithmetic number, because the mean of its divisors is an integer number (26330781).

Almost surely, 2^52661561 is an apocalyptic number.

It is an amenable number.

52661561 is a deficient number, since it is larger than the sum of its proper divisors (1).

52661561 is an equidigital number, since it uses as much as digits as its factorization.

52661561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 32.

The square root of 52661561 is about 7256.8285772781. The cubic root of 52661561 is about 374.8273243524.

The spelling of 52661561 in words is "fifty-two million, six hundred sixty-one thousand, five hundred sixty-one".