1243431103 has 4 divisors (see below), whose sum is σ = 1245640248. Its totient is φ = 1241221960.

The previous prime is 1243431073. The next prime is 1243431113. The reversal of 1243431103 is 3011343421.

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 1243431103 - 2⁵ = 1243431071 is a prime.

It is a super-2 number, since 2×1243431103² = 3092241815815593218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243431113) 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, 1103728 + ... + 1104853.

It is an arithmetic number, because the mean of its divisors is an integer number (311410062).

Almost surely, 2^1243431103 is an apocalyptic number.

1243431103 is a deficient number, since it is larger than the sum of its proper divisors (2209145).

1243431103 is an equidigital number, since it uses as much as digits as its factorization.

1243431103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2209144.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1243431103 is about 35262.3184575263. The cubic root of 1243431103 is about 1075.3270619761.

Adding to 1243431103 its reverse (3011343421), we get a palindrome (4254774524).

The spelling of 1243431103 in words is "one billion, two hundred forty-three million, four hundred thirty-one thousand, one hundred three".