102112139 has 2 divisors, whose sum is σ = 102112140. Its totient is φ = 102112138.

The previous prime is 102112121. The next prime is 102112159. The reversal of 102112139 is 931211201.

It is an a-pointer prime, because the next prime (102112159) can be obtained adding 102112139 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102112139 - 2⁸ = 102111883 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102112139.

It is not a weakly prime, because it can be changed into another prime (102112159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51056069 + 51056070.

It is an arithmetic number, because the mean of its divisors is an integer number (51056070).

Almost surely, 2^102112139 is an apocalyptic number.

102112139 is a deficient number, since it is larger than the sum of its proper divisors (1).

102112139 is an equidigital number, since it uses as much as digits as its factorization.

102112139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 102112139 is about 10105.0551210768. The cubic root of 102112139 is about 467.4040357041.

The spelling of 102112139 in words is "one hundred two million, one hundred twelve thousand, one hundred thirty-nine".