1261013103 has 20 divisors (see below), whose sum is σ = 2152841680. Its totient is φ = 720578592.

The previous prime is 1261013093. The next prime is 1261013129. The reversal of 1261013103 is 3013101621.

It is not a de Polignac number, because 1261013103 - 2⁸ = 1261012847 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 (1261013503) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1111438 + ... + 1112571.

It is an arithmetic number, because the mean of its divisors is an integer number (107642084).

Almost surely, 2^1261013103 is an apocalyptic number.

1261013103 is a deficient number, since it is larger than the sum of its proper divisors (891828577).

1261013103 is an equidigital number, since it uses as much as digits as its factorization.

1261013103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2224028 (or 2224019 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 1261013103 is about 35510.7463030559. The cubic root of 1261013103 is about 1080.3717007618.

Adding to 1261013103 its reverse (3013101621), we get a palindrome (4274114724).

The spelling of 1261013103 in words is "one billion, two hundred sixty-one million, thirteen thousand, one hundred three".