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BaseRepresentation
bin100111101001010111
322020202111
4213221113
520144031
63251451
71244305
oct475127
9266674
10162391
11101009
1279b87
1358bb8
1443275
15331b1
hex27a57

162391 has 2 divisors, whose sum is σ = 162392. Its totient is φ = 162390.

The previous prime is 162389. The next prime is 162413. The reversal of 162391 is 193261.

It is an a-pointer prime, because the next prime (162413) can be obtained adding 162391 to its sum of digits (22).

It is a weak prime.

It is an emirp because it is prime and its reverse (193261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 162391 - 21 = 162389 is a prime.

Together with 162389, 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 (162091) 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, 81195 + 81196.

It is an arithmetic number, because the mean of its divisors is an integer number (81196).

2162391 is an apocalyptic number.

162391 is a deficient number, since it is larger than the sum of its proper divisors (1).

162391 is an equidigital number, since it uses as much as digits as its factorization.

162391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 22.

The square root of 162391 is about 402.9776668750. The cubic root of 162391 is about 54.5574402112.

The spelling of 162391 in words is "one hundred sixty-two thousand, three hundred ninety-one".