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81636053 is a prime number
BaseRepresentation
bin1001101110110…
…10101011010101
312200121112121112
410313122223111
5131344323203
612033424405
72010615662
oct467325325
9180545545
1081636053
1142099414
122340b105
1313bb3c75
14abb0a69
1572786d8
hex4ddaad5

81636053 has 2 divisors, whose sum is σ = 81636054. Its totient is φ = 81636052.

The previous prime is 81636047. The next prime is 81636077. The reversal of 81636053 is 35063618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77404804 + 4231249 = 8798^2 + 2057^2 .

It is a cyclic number.

It is not a de Polignac number, because 81636053 - 218 = 81373909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81636953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40818026 + 40818027.

It is an arithmetic number, because the mean of its divisors is an integer number (40818027).

Almost surely, 281636053 is an apocalyptic number.

It is an amenable number.

81636053 is a deficient number, since it is larger than the sum of its proper divisors (1).

81636053 is an equidigital number, since it uses as much as digits as its factorization.

81636053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 81636053 is about 9035.2671792261. The cubic root of 81636053 is about 433.8044469297.

The spelling of 81636053 in words is "eighty-one million, six hundred thirty-six thousand, fifty-three".