1311202223 has 4 divisors (see below), whose sum is σ = 1311292560. Its totient is φ = 1311111888.

The previous prime is 1311202199. The next prime is 1311202247. The reversal of 1311202223 is 3222021131.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3222021131 = 7 ⋅460288733.

It is an interprime number because it is at equal distance from previous prime (1311202199) and next prime (1311202247).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311202223 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 (1311202273) 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 3 ways as a sum of consecutive naturals, for example, 17915 + ... + 54252.

It is an arithmetic number, because the mean of its divisors is an integer number (327823140).

Almost surely, 2^1311202223 is an apocalyptic number.

1311202223 is a deficient number, since it is larger than the sum of its proper divisors (90337).

1311202223 is an equidigital number, since it uses as much as digits as its factorization.

1311202223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90336.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1311202223 is about 36210.5264115285. The cubic root of 1311202223 is about 1094.5187999856.

Adding to 1311202223 its reverse (3222021131), we get a palindrome (4533223354).

The spelling of 1311202223 in words is "one billion, three hundred eleven million, two hundred two thousand, two hundred twenty-three".