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129641 is a prime number
BaseRepresentation
bin11111101001101001
320120211112
4133221221
513122031
62440105
71046651
oct375151
9216745
10129641
1189446
1263035
1347015
1435361
152862b
hex1fa69

129641 has 2 divisors, whose sum is σ = 129642. Its totient is φ = 129640.

The previous prime is 129631. The next prime is 129643. The reversal of 129641 is 146921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87616 + 42025 = 296^2 + 205^2 .

It is an emirp because it is prime and its reverse (146921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-129641 is a prime.

Together with 129643, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129643) 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, 64820 + 64821.

It is an arithmetic number, because the mean of its divisors is an integer number (64821).

2129641 is an apocalyptic number.

It is an amenable number.

129641 is a deficient number, since it is larger than the sum of its proper divisors (1).

129641 is an equidigital number, since it uses as much as digits as its factorization.

129641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 23.

The square root of 129641 is about 360.0569399414. The cubic root of 129641 is about 50.6112958893.

The spelling of 129641 in words is "one hundred twenty-nine thousand, six hundred forty-one".