1231131203 has 4 divisors (see below), whose sum is σ = 1247996088. Its totient is φ = 1214266320.

The previous prime is 1231131199. The next prime is 1231131217. The reversal of 1231131203 is 3021311321.

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 1231131203 - 2² = 1231131199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231131233) 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, 8432333 + ... + 8432478.

It is an arithmetic number, because the mean of its divisors is an integer number (311999022).

Almost surely, 2^1231131203 is an apocalyptic number.

1231131203 is a deficient number, since it is larger than the sum of its proper divisors (16864885).

1231131203 is an equidigital number, since it uses as much as digits as its factorization.

1231131203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16864884.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1231131203 is about 35087.4792910520. The cubic root of 1231131203 is about 1071.7696290982.

Adding to 1231131203 its reverse (3021311321), we get a palindrome (4252442524).

The spelling of 1231131203 in words is "one billion, two hundred thirty-one million, one hundred thirty-one thousand, two hundred three".