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1111000081 is a prime number
BaseRepresentation
bin100001000111000…
…1000010000010001
32212102112122121011
41002032020100101
54233404000311
6302124330521
736350226202
oct10216102021
92772478534
101111000081
11520148894
122700a3a41
131492327c9
14a77a35a9
156780a321
hex42388411

1111000081 has 2 divisors, whose sum is σ = 1111000082. Its totient is φ = 1111000080.

The previous prime is 1111000057. The next prime is 1111000087. The reversal of 1111000081 is 1800001111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 705380481 + 405619600 = 26559^2 + 20140^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111000081 - 215 = 1110967313 is a prime.

It is a super-2 number, since 2×11110000812 = 2468642359964013122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1111000087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555500040 + 555500041.

It is an arithmetic number, because the mean of its divisors is an integer number (555500041).

Almost surely, 21111000081 is an apocalyptic number.

It is an amenable number.

1111000081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111000081 is an equidigital number, since it uses as much as digits as its factorization.

1111000081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 13.

The square root of 1111000081 is about 33331.6678400586. The cubic root of 1111000081 is about 1035.7096678650.

Adding to 1111000081 its reverse (1800001111), we get a palindrome (2911001192).

The spelling of 1111000081 in words is "one billion, one hundred eleven million, eighty-one", and thus it is an aban number.