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1011055561 is a prime number
BaseRepresentation
bin111100010000110…
…111101111001001
32121110110221111021
4330100313233021
54032312234221
6244154232441
734024554565
oct7420675711
92543427437
101011055561
1147979500a
12242725721
1313160b339
14983c86a5
155db67041
hex3c437bc9

1011055561 has 2 divisors, whose sum is σ = 1011055562. Its totient is φ = 1011055560.

The previous prime is 1011055543. The next prime is 1011055571. The reversal of 1011055561 is 1655501101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 679123600 + 331931961 = 26060^2 + 18219^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011055561 - 213 = 1011047369 is a prime.

It is not a weakly prime, because it can be changed into another prime (1011055571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505527780 + 505527781.

It is an arithmetic number, because the mean of its divisors is an integer number (505527781).

Almost surely, 21011055561 is an apocalyptic number.

It is an amenable number.

1011055561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011055561 is an equidigital number, since it uses as much as digits as its factorization.

1011055561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 750, while the sum is 25.

The square root of 1011055561 is about 31797.0998834799. The cubic root of 1011055561 is about 1003.6716891987.

Adding to 1011055561 its reverse (1655501101), we get a palindrome (2666556662).

The spelling of 1011055561 in words is "one billion, eleven million, fifty-five thousand, five hundred sixty-one".