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129169 is a prime number
BaseRepresentation
bin11111100010010001
320120012001
4133202101
513113134
62434001
71045405
oct374221
9216161
10129169
1189057
1262901
1346a41
1435105
1528414
hex1f891

129169 has 2 divisors, whose sum is σ = 129170. Its totient is φ = 129168.

The previous prime is 129127. The next prime is 129187. The reversal of 129169 is 961921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82944 + 46225 = 288^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 129169 - 29 = 128657 is a prime.

It is a super-2 number, since 2×1291692 = 33369261122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64584 + 64585.

It is an arithmetic number, because the mean of its divisors is an integer number (64585).

2129169 is an apocalyptic number.

129169 is the 208-th hex number.

It is an amenable number.

129169 is a deficient number, since it is larger than the sum of its proper divisors (1).

129169 is an equidigital number, since it uses as much as digits as its factorization.

129169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 28.

The square root of 129169 is about 359.4008903717. The cubic root of 129169 is about 50.5497989304.

The spelling of 129169 in words is "one hundred twenty-nine thousand, one hundred sixty-nine".