102139 has 2 divisors, whose sum is σ = 102140.
Its totient is φ = 102138.
The previous prime is 102121. The next prime is 102149. The reversal of 102139 is 931201.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 102139 - 25 = 102107 is a prime.
It is not a weakly prime, because it can be changed into another prime (102149) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51069 + 51070.
It is an arithmetic number, because the mean of its divisors is an integer number (51070).
2102139 is an apocalyptic number.
102139 is a deficient number, since it is larger than the sum of its proper divisors (1).
102139 is an equidigital number, since it uses as much as digits as its factorization.
102139 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 54, while the sum is 16.
The square root of 102139 is about 319.5919273073.
The cubic root of 102139 is about 46.7445016268.
The spelling of 102139 in words is "one hundred two thousand, one hundred thirty-nine".