102102139 has 2 divisors, whose sum is σ = 102102140. Its totient is φ = 102102138.

The previous prime is 102102109. The next prime is 102102157. The reversal of 102102139 is 931201201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 102102139 - 2²⁵ = 68547707 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (102102109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51051069 + 51051070.

It is an arithmetic number, because the mean of its divisors is an integer number (51051070).

Almost surely, 2^102102139 is an apocalyptic number.

102102139 is a deficient number, since it is larger than the sum of its proper divisors (1).

102102139 is an equidigital number, since it uses as much as digits as its factorization.

102102139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 102102139 is about 10104.5603071089. The cubic root of 102102139 is about 467.3887773388.

The spelling of 102102139 in words is "one hundred two million, one hundred two thousand, one hundred thirty-nine".