1025561 has 2 divisors, whose sum is σ = 1025562. Its totient is φ = 1025560.

The previous prime is 1025551. The next prime is 1025579. The reversal of 1025561 is 1655201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 755161 + 270400 = 869^2 + 520^2 .

It is an emirp because it is prime and its reverse (1655201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1025561 - 2¹⁸ = 763417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1025551) 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, 512780 + 512781.

It is an arithmetic number, because the mean of its divisors is an integer number (512781).

2^1025561 is an apocalyptic number.

It is an amenable number.

1025561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025561 is an equidigital number, since it uses as much as digits as its factorization.

1025561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 1025561 is about 1012.6998568184. The cubic root of 1025561 is about 100.8448750913.

The spelling of 1025561 in words is "one million, twenty-five thousand, five hundred sixty-one".