1243320103 has 12 divisors (see below), whose sum is σ = 1317655768. Its totient is φ = 1172495520.

The previous prime is 1243320079. The next prime is 1243320151. The reversal of 1243320103 is 3010233421.

It is not a de Polignac number, because 1243320103 - 2²⁵ = 1209765671 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 (1243321103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18973 + ... + 53353.

Almost surely, 2^1243320103 is an apocalyptic number.

1243320103 is a deficient number, since it is larger than the sum of its proper divisors (74335665).

1243320103 is an equidigital number, since it uses as much as digits as its factorization.

1243320103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34482 (or 34453 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1243320103 is about 35260.7445043351. The cubic root of 1243320103 is about 1075.2950631905.

Adding to 1243320103 its reverse (3010233421), we get a palindrome (4253553524).

The spelling of 1243320103 in words is "one billion, two hundred forty-three million, three hundred twenty thousand, one hundred three".