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1679981 is a prime number
BaseRepresentation
bin110011010001001101101
310011100111112
412122021231
5412224411
6100001405
720164622
oct6321155
93140445
101679981
11a48216
12690265
1346a894
1431a349
15232b8b
hex19a26d

1679981 has 2 divisors, whose sum is σ = 1679982. Its totient is φ = 1679980.

The previous prime is 1679963. The next prime is 1680013. The reversal of 1679981 is 1899761.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1612900 + 67081 = 1270^2 + 259^2 .

It is a cyclic number.

It is not a de Polignac number, because 1679981 - 26 = 1679917 is a prime.

It is a super-2 number, since 2×16799812 = 5644672320722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1679281) 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, 839990 + 839991.

It is an arithmetic number, because the mean of its divisors is an integer number (839991).

21679981 is an apocalyptic number.

It is an amenable number.

1679981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1679981 is an equidigital number, since it uses as much as digits as its factorization.

1679981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 41.

The square root of 1679981 is about 1296.1408102517. The cubic root of 1679981 is about 118.8779909007.

It can be divided in two parts, 16 and 79981, that added together give a palindrome (79997).

The spelling of 1679981 in words is "one million, six hundred seventy-nine thousand, nine hundred eighty-one".