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BaseRepresentation
bin1101111011001
3100210001
41233121
5212004
653001
726533
oct15731
910701
107129
1153a1
124161
133325
142853
1521a4
hex1bd9

7129 has 2 divisors, whose sum is σ = 7130. Its totient is φ = 7128.

The previous prime is 7127. The next prime is 7151. The reversal of 7129 is 9217.

7129 is nontrivially palindromic in base 9.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6400 + 729 = 80^2 + 27^2 .

It is a cyclic number.

It is not a de Polignac number, because 7129 - 21 = 7127 is a prime.

Together with 7127, it forms a pair of twin primes.

It is a Chen prime.

7129 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (7121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3564 + 3565.

It is an arithmetic number, because the mean of its divisors is an integer number (3565).

27129 is an apocalyptic number.

It is an amenable number.

7129 is a deficient number, since it is larger than the sum of its proper divisors (1).

7129 is an equidigital number, since it uses as much as digits as its factorization.

7129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 126, while the sum is 19.

The square root of 7129 is about 84.4334057112. The cubic root of 7129 is about 19.2461059195.

It can be divided in two parts, 71 and 29, that added together give a square (100 = 102).

The spelling of 7129 in words is "seven thousand, one hundred twenty-nine".