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1025561 is a prime number
BaseRepresentation
bin11111010011000011001
31221002210202
43322120121
5230304221
633551545
711500655
oct3723031
91832722
101025561
11640579
124155b5
1329ba54
141c9a65
15153d0b
hexfa619

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).

21025561 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".