1205120103 has 16 divisors (see below), whose sum is σ = 1753729536. Its totient is φ = 730031040.

The previous prime is 1205120101. The next prime is 1205120129. The reversal of 1205120103 is 3010215021.

It is not a de Polignac number, because 1205120103 - 2¹ = 1205120101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205120101) 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 15 ways as a sum of consecutive naturals, for example, 74226 + ... + 88992.

It is an arithmetic number, because the mean of its divisors is an integer number (109608096).

Almost surely, 2^1205120103 is an apocalyptic number.

1205120103 is a deficient number, since it is larger than the sum of its proper divisors (548609433).

1205120103 is a wasteful number, since it uses less digits than its factorization.

1205120103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17254.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 1205120103 is about 34714.8398095109. The cubic root of 1205120103 is about 1064.1677917560.

Adding to 1205120103 its reverse (3010215021), we get a palindrome (4215335124).

The spelling of 1205120103 in words is "one billion, two hundred five million, one hundred twenty thousand, one hundred three".