1231355103 has 16 divisors (see below), whose sum is σ = 1791926400. Its totient is φ = 745915680.

The previous prime is 1231355093. The next prime is 1231355113. The reversal of 1231355103 is 3015531321.

It is an interprime number because it is at equal distance from previous prime (1231355093) and next prime (1231355113).

It is not a de Polignac number, because 1231355103 - 2¹⁰ = 1231354079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231355113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71028 + ... + 86646.

It is an arithmetic number, because the mean of its divisors is an integer number (111995400).

Almost surely, 2^1231355103 is an apocalyptic number.

1231355103 is a deficient number, since it is larger than the sum of its proper divisors (560571297).

1231355103 is a wasteful number, since it uses less digits than its factorization.

1231355103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18022.

The product of its (nonzero) digits is 1350, while the sum is 24.

The square root of 1231355103 is about 35090.6697428248. The cubic root of 1231355103 is about 1071.8345977150.

Adding to 1231355103 its reverse (3015531321), we get a palindrome (4246886424).

The spelling of 1231355103 in words is "one billion, two hundred thirty-one million, three hundred fifty-five thousand, one hundred three".