252520561 has 2 divisors, whose sum is σ = 252520562. Its totient is φ = 252520560.

The previous prime is 252520559. The next prime is 252520571. The reversal of 252520561 is 165025252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196868961 + 55651600 = 14031^2 + 7460^2 .

It is a cyclic number.

It is not a de Polignac number, because 252520561 - 2¹ = 252520559 is a prime.

Together with 252520559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (252520511) 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, 126260280 + 126260281.

It is an arithmetic number, because the mean of its divisors is an integer number (126260281).

Almost surely, 2^252520561 is an apocalyptic number.

It is an amenable number.

252520561 is a deficient number, since it is larger than the sum of its proper divisors (1).

252520561 is an equidigital number, since it uses as much as digits as its factorization.

252520561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 252520561 is about 15890.8955380117. The cubic root of 252520561 is about 632.0705879404.

The spelling of 252520561 in words is "two hundred fifty-two million, five hundred twenty thousand, five hundred sixty-one".