557521 has 2 divisors, whose sum is σ = 557522. Its totient is φ = 557520.

The previous prime is 557519. The next prime is 557533. The reversal of 557521 is 125755.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 342225 + 215296 = 585^2 + 464^2 .

It is a cyclic number.

It is not a de Polignac number, because 557521 - 2¹ = 557519 is a prime.

Together with 557519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (557551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278760 + 278761.

It is an arithmetic number, because the mean of its divisors is an integer number (278761).

2⁵⁵⁷⁵²¹ is an apocalyptic number.

It is an amenable number.

557521 is a deficient number, since it is larger than the sum of its proper divisors (1).

557521 is an equidigital number, since it uses as much as digits as its factorization.

557521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1750, while the sum is 25.

The square root of 557521 is about 746.6732886611. The cubic root of 557521 is about 82.3038991020.

The spelling of 557521 in words is "five hundred fifty-seven thousand, five hundred twenty-one".