1213503103 has 4 divisors (see below), whose sum is σ = 1230594768. Its totient is φ = 1196411440.

The previous prime is 1213503101. The next prime is 1213503143. The reversal of 1213503103 is 3013053121.

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

It is a cyclic number.

It is not a de Polignac number, because 1213503103 - 2¹ = 1213503101 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 (1213503101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8545726 + ... + 8545867.

It is an arithmetic number, because the mean of its divisors is an integer number (307648692).

Almost surely, 2^1213503103 is an apocalyptic number.

1213503103 is a deficient number, since it is larger than the sum of its proper divisors (17091665).

1213503103 is an equidigital number, since it uses as much as digits as its factorization.

1213503103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17091664.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 1213503103 is about 34835.3714347931. The cubic root of 1213503103 is about 1066.6295970299.

Adding to 1213503103 its reverse (3013053121), we get a palindrome (4226556224).

The spelling of 1213503103 in words is "one billion, two hundred thirteen million, five hundred three thousand, one hundred three".