1311231303 has 24 divisors (see below), whose sum is σ = 1921267712. Its totient is φ = 861649488.

The previous prime is 1311231277. The next prime is 1311231307. The reversal of 1311231303 is 3031321131.

It is a happy number.

1311231303 is a `hidden beast` number, since 131 + 1 + 231 + 303 = 666.

It is not a de Polignac number, because 1311231303 - 2²⁴ = 1294454087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311231307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 203550 + ... + 209892.

Almost surely, 2^1311231303 is an apocalyptic number.

1311231303 is a deficient number, since it is larger than the sum of its proper divisors (610036409).

1311231303 is a wasteful number, since it uses less digits than its factorization.

1311231303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6675 (or 6672 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 1311231303 is about 36210.9279499987. The cubic root of 1311231303 is about 1094.5268913822.

Adding to 1311231303 its reverse (3031321131), we get a palindrome (4342552434).

The spelling of 1311231303 in words is "one billion, three hundred eleven million, two hundred thirty-one thousand, three hundred three".