1305121103 has 16 divisors (see below), whose sum is σ = 1540202496. Its totient is φ = 1090268640.

The previous prime is 1305121043. The next prime is 1305121109. The reversal of 1305121103 is 3011215031.

It is a cyclic number.

It is not a de Polignac number, because 1305121103 - 2⁸ = 1305120847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305121109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11426 + ... + 52352.

It is an arithmetic number, because the mean of its divisors is an integer number (96262656).

Almost surely, 2^1305121103 is an apocalyptic number.

1305121103 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1305121103 is a deficient number, since it is larger than the sum of its proper divisors (235081393).

1305121103 is a wasteful number, since it uses less digits than its factorization.

1305121103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41174.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 1305121103 is about 36126.4598736162. The cubic root of 1305121103 is about 1092.8241169778.

Adding to 1305121103 its reverse (3011215031), we get a palindrome (4316336134).

The spelling of 1305121103 in words is "one billion, three hundred five million, one hundred twenty-one thousand, one hundred three".