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13171861 is a prime number
BaseRepresentation
bin110010001111…
…110010010101
3220210012101201
4302033302111
511332444421
61150152501
7216646633
oct62176225
926705351
1013171861
11748723a
1244b2731
132962501
141a6c353
151252b91
hexc8fc95

13171861 has 2 divisors, whose sum is σ = 13171862. Its totient is φ = 13171860.

The previous prime is 13171853. The next prime is 13171877. The reversal of 13171861 is 16817131.

13171861 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12916836 + 255025 = 3594^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 13171861 - 23 = 13171853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13171811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6585930 + 6585931.

It is an arithmetic number, because the mean of its divisors is an integer number (6585931).

Almost surely, 213171861 is an apocalyptic number.

It is an amenable number.

13171861 is a deficient number, since it is larger than the sum of its proper divisors (1).

13171861 is an equidigital number, since it uses as much as digits as its factorization.

13171861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 28.

The square root of 13171861 is about 3629.3058564965. The cubic root of 13171861 is about 236.1650968207.

Adding to 13171861 its reverse (16817131), we get a palindrome (29988992).

The spelling of 13171861 in words is "thirteen million, one hundred seventy-one thousand, eight hundred sixty-one".