1231031120203 has 4 divisors (see below), whose sum is σ = 1249404719080. Its totient is φ = 1212657521328.

The previous prime is 1231031120183. The next prime is 1231031120237. The reversal of 1231031120203 is 3020211301321.

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 1231031120203 - 2²⁹ = 1230494249291 is a prime.

It is a super-2 number, since 2×1231031120203² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231031129203) 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, 9186799338 + ... + 9186799471.

It is an arithmetic number, because the mean of its divisors is an integer number (312351179770).

Almost surely, 2^{1231031120203} is an apocalyptic number.

1231031120203 is a deficient number, since it is larger than the sum of its proper divisors (18373598877).

1231031120203 is an equidigital number, since it uses as much as digits as its factorization.

1231031120203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18373598876.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 1231031120203 its reverse (3020211301321), we get a palindrome (4251242421524).

The spelling of 1231031120203 in words is "one trillion, two hundred thirty-one billion, thirty-one million, one hundred twenty thousand, two hundred three".