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BaseRepresentation
bin110000110110…
…010000001001
3220002120100001
4300312100021
511234231004
61134243001
7213561511
oct60662011
926076301
1012805129
117256757
124356461
1328645cc
1419b4841
1511ce1a4
hexc36409

12805129 has 2 divisors, whose sum is σ = 12805130. Its totient is φ = 12805128.

The previous prime is 12805127. The next prime is 12805141. The reversal of 12805129 is 92150821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12531600 + 273529 = 3540^2 + 523^2 .

It is a cyclic number.

It is not a de Polignac number, because 12805129 - 21 = 12805127 is a prime.

Together with 12805127, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 12805097 and 12805106.

It is not a weakly prime, because it can be changed into another prime (12805127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6402564 + 6402565.

It is an arithmetic number, because the mean of its divisors is an integer number (6402565).

Almost surely, 212805129 is an apocalyptic number.

It is an amenable number.

12805129 is a deficient number, since it is larger than the sum of its proper divisors (1).

12805129 is an equidigital number, since it uses as much as digits as its factorization.

12805129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 12805129 is about 3578.4254917491. The cubic root of 12805129 is about 233.9526592326.

The spelling of 12805129 in words is "twelve million, eight hundred five thousand, one hundred twenty-nine".