1311203131 has 8 divisors (see below), whose sum is σ = 1500124640. Its totient is φ = 1122683328.

The previous prime is 1311203111. The next prime is 1311203137. The reversal of 1311203131 is 1313021131.

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

It is a cyclic number.

It is not a de Polignac number, because 1311203131 - 2¹⁵ = 1311170363 is a prime.

It is a super-2 number, since 2×1311203131² = 3438507301488406322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1311203137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93396 + ... + 106513.

It is an arithmetic number, because the mean of its divisors is an integer number (187515580).

Almost surely, 2^1311203131 is an apocalyptic number.

1311203131 is a deficient number, since it is larger than the sum of its proper divisors (188921509).

1311203131 is an equidigital number, since it uses as much as digits as its factorization.

1311203131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200853.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1311203131 is about 36210.5389493170. The cubic root of 1311203131 is about 1094.5190526349.

Adding to 1311203131 its reverse (1313021131), we get a palindrome (2624224262).

The spelling of 1311203131 in words is "one billion, three hundred eleven million, two hundred three thousand, one hundred thirty-one".