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989581 is a prime number
BaseRepresentation
bin11110001100110001101
31212021110011
43301212031
5223131311
633113221
711261035
oct3614615
91767404
10989581
1161653a
123b8811
13288568
141ba8c5
15148321
hexf198d

989581 has 2 divisors, whose sum is σ = 989582. Its totient is φ = 989580.

The previous prime is 989579. The next prime is 989623. The reversal of 989581 is 185989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 855625 + 133956 = 925^2 + 366^2 .

It is a cyclic number.

It is not a de Polignac number, because 989581 - 21 = 989579 is a prime.

It is a super-2 number, since 2×9895812 = 1958541111122, which contains 22 as substring.

Together with 989579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989561) 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, 494790 + 494791.

It is an arithmetic number, because the mean of its divisors is an integer number (494791).

2989581 is an apocalyptic number.

It is an amenable number.

989581 is a deficient number, since it is larger than the sum of its proper divisors (1).

989581 is an equidigital number, since it uses as much as digits as its factorization.

989581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 40.

The square root of 989581 is about 994.7768594011. The cubic root of 989581 is about 99.6514867965.

The spelling of 989581 in words is "nine hundred eighty-nine thousand, five hundred eighty-one".