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129121 is a prime number
BaseRepresentation
bin11111100001100001
320120010021
4133201201
513112441
62433441
71045306
oct374141
9216107
10129121
1189013
1262881
1346a05
14350ad
15283d1
hex1f861

129121 has 2 divisors, whose sum is σ = 129122. Its totient is φ = 129120.

The previous prime is 129119. The next prime is 129127. The reversal of 129121 is 121921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96721 + 32400 = 311^2 + 180^2 .

It is an emirp because it is prime and its reverse (121921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129121 - 21 = 129119 is a prime.

Together with 129119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 129095 and 129104.

It is not a weakly prime, because it can be changed into another prime (129127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64560 + 64561.

It is an arithmetic number, because the mean of its divisors is an integer number (64561).

2129121 is an apocalyptic number.

It is an amenable number.

129121 is a deficient number, since it is larger than the sum of its proper divisors (1).

129121 is an equidigital number, since it uses as much as digits as its factorization.

129121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36, while the sum is 16.

The square root of 129121 is about 359.3341063690. The cubic root of 129121 is about 50.5435366152.

The spelling of 129121 in words is "one hundred twenty-nine thousand, one hundred twenty-one".