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30139 is a prime number
BaseRepresentation
bin111010110111011
31112100021
413112323
51431024
6351311
7153604
oct72673
945307
1030139
112070a
1215537
1310945
14adab
158de4
hex75bb

30139 has 2 divisors, whose sum is σ = 30140. Its totient is φ = 30138.

The previous prime is 30137. The next prime is 30161. The reversal of 30139 is 93103.

It can be divided in two parts, 30 and 139, that added together give a square (169 = 132).

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (93103) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30139 - 21 = 30137 is a prime.

Together with 30137, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (30133) 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, 15069 + 15070.

It is an arithmetic number, because the mean of its divisors is an integer number (15070).

230139 is an apocalyptic number.

30139 is a deficient number, since it is larger than the sum of its proper divisors (1).

30139 is an equidigital number, since it uses as much as digits as its factorization.

30139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81, while the sum is 16.

The square root of 30139 is about 173.6058754766. The cubic root of 30139 is about 31.1202406125.

The spelling of 30139 in words is "thirty thousand, one hundred thirty-nine".