1020557 has 2 divisors, whose sum is σ = 1020558. Its totient is φ = 1020556.

The previous prime is 1020541. The next prime is 1020583. The reversal of 1020557 is 7550201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 978121 + 42436 = 989^2 + 206^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020557 - 2⁴ = 1020541 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510278 + 510279.

It is an arithmetic number, because the mean of its divisors is an integer number (510279).

2^1020557 is an apocalyptic number.

It is an amenable number.

1020557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020557 is an equidigital number, since it uses as much as digits as its factorization.

1020557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 1020557 is about 1010.2262122911. The cubic root of 1020557 is about 100.6805907867.

Adding to 1020557 its reverse (7550201), we get a palindrome (8570758).

The spelling of 1020557 in words is "one million, twenty thousand, five hundred fifty-seven".