1311203223 has 24 divisors (see below), whose sum is σ = 2087454096. Its totient is φ = 786470400.

The previous prime is 1311203219. The next prime is 1311203273. The reversal of 1311203223 is 3223021131.

It is not a de Polignac number, because 1311203223 - 2² = 1311203219 is a prime.

It is a super-4 number, since 4×1311203223⁴ (a number of 38 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1311203196 and 1311203205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311203203) 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 23 ways as a sum of consecutive naturals, for example, 58668 + ... + 77873.

It is an arithmetic number, because the mean of its divisors is an integer number (86977254).

Almost surely, 2^1311203223 is an apocalyptic number.

1311203223 is a deficient number, since it is larger than the sum of its proper divisors (776250873).

1311203223 is a wasteful number, since it uses less digits than its factorization.

1311203223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136655 (or 136652 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1311203223 is about 36210.5402196653. The cubic root of 1311203223 is about 1094.5190782337.

Adding to 1311203223 its reverse (3223021131), we get a palindrome (4534224354).

The spelling of 1311203223 in words is "one billion, three hundred eleven million, two hundred three thousand, two hundred twenty-three".