1213131203 has 4 divisors (see below), whose sum is σ = 1284491880. Its totient is φ = 1141770528.

The previous prime is 1213131197. The next prime is 1213131211. The reversal of 1213131203 is 3021313121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3021313121 = 109 ⋅27718469.

It is a cyclic number.

It is not a de Polignac number, because 1213131203 - 2¹² = 1213127107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 71360659 = 1213131203 / (1 + 2 + 1 + 3 + 1 + 3 + 1 + 2 + 0 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213131223) 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, 35680313 + ... + 35680346.

It is an arithmetic number, because the mean of its divisors is an integer number (321122970).

Almost surely, 2^1213131203 is an apocalyptic number.

1213131203 is a deficient number, since it is larger than the sum of its proper divisors (71360677).

1213131203 is an equidigital number, since it uses as much as digits as its factorization.

1213131203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71360676.

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

The square root of 1213131203 is about 34830.0330605643. The cubic root of 1213131203 is about 1066.5206232453.

Adding to 1213131203 its reverse (3021313121), we get a palindrome (4234444324).

It can be divided in two parts, 12131 and 31203, that added together give a palindrome (43334).

The spelling of 1213131203 in words is "one billion, two hundred thirteen million, one hundred thirty-one thousand, two hundred three".