103128205139 has 4 divisors (see below), whose sum is σ = 103520327856. Its totient is φ = 102736082424.

The previous prime is 103128205127. The next prime is 103128205163. The reversal of 103128205139 is 931502821301.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-103128205139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 103128205099 and 103128205108.

It is not an unprimeable number, because it can be changed into a prime (103128205039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196060964 + ... + 196061489.

It is an arithmetic number, because the mean of its divisors is an integer number (25880081964).

Almost surely, 2^103128205139 is an apocalyptic number.

103128205139 is a deficient number, since it is larger than the sum of its proper divisors (392122717).

103128205139 is an equidigital number, since it uses as much as digits as its factorization.

103128205139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392122716.

The product of its (nonzero) digits is 12960, while the sum is 35.

The spelling of 103128205139 in words is "one hundred three billion, one hundred twenty-eight million, two hundred five thousand, one hundred thirty-nine".