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81000593 is a prime number
BaseRepresentation
bin1001101001111…
…11100010010001
312122102020220222
410310333202101
5131214004333
612012042425
72002331222
oct464774221
9178366828
1081000593
11417a4a43
1223163415
1313a2095b
14aa87249
1571a0298
hex4d3f891

81000593 has 2 divisors, whose sum is σ = 81000594. Its totient is φ = 81000592.

The previous prime is 81000587. The next prime is 81000643. The reversal of 81000593 is 39500018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67699984 + 13300609 = 8228^2 + 3647^2 .

It is a cyclic number.

It is not a de Polignac number, because 81000593 - 220 = 79952017 is a prime.

It is a super-2 number, since 2×810005932 = 13122192132703298, which contains 22 as substring.

It is equal to p4724450 and since 81000593 and 4724450 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (81000523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40500296 + 40500297.

It is an arithmetic number, because the mean of its divisors is an integer number (40500297).

Almost surely, 281000593 is an apocalyptic number.

It is an amenable number.

81000593 is a deficient number, since it is larger than the sum of its proper divisors (1).

81000593 is an equidigital number, since it uses as much as digits as its factorization.

81000593 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 81000593 is about 9000.0329443841. The cubic root of 81000593 is about 432.6759269588.

The spelling of 81000593 in words is "eighty-one million, five hundred ninety-three", and thus it is an aban number.