1311211203 has 8 divisors (see below), whose sum is σ = 1752686928. Its totient is φ = 871938144.

The previous prime is 1311211159. The next prime is 1311211211. The reversal of 1311211203 is 3021121131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1311211203 - 2⁸ = 1311210947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1311211243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 549276 + ... + 551657.

It is an arithmetic number, because the mean of its divisors is an integer number (219085866).

Almost surely, 2^1311211203 is an apocalyptic number.

1311211203 is a deficient number, since it is larger than the sum of its proper divisors (441475725).

1311211203 is a wasteful number, since it uses less digits than its factorization.

1311211203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101333.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1311211203 is about 36210.6504084088. The cubic root of 1311211203 is about 1094.5212986484.

Adding to 1311211203 its reverse (3021121131), we get a palindrome (4332332334).

The spelling of 1311211203 in words is "one billion, three hundred eleven million, two hundred eleven thousand, two hundred three".