1131213223 has 4 divisors (see below), whose sum is σ = 1292815120. Its totient is φ = 969611328.

The previous prime is 1131213217. The next prime is 1131213253. The reversal of 1131213223 is 3223121311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3223121311 = 1087 ⋅2965153.

It is not a de Polignac number, because 1131213223 - 2⁹ = 1131212711 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1131213223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131213253) 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 3 ways as a sum of consecutive naturals, for example, 80800938 + ... + 80800951.

It is an arithmetic number, because the mean of its divisors is an integer number (323203780).

Almost surely, 2^1131213223 is an apocalyptic number.

1131213223 is a deficient number, since it is larger than the sum of its proper divisors (161601897).

1131213223 is an equidigital number, since it uses as much as digits as its factorization.

1131213223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161601896.

The product of its digits is 216, while the sum is 19.

The square root of 1131213223 is about 33633.5133906644. The cubic root of 1131213223 is about 1041.9530677982.

Adding to 1131213223 its reverse (3223121311), we get a palindrome (4354334534).

The spelling of 1131213223 in words is "one billion, one hundred thirty-one million, two hundred thirteen thousand, two hundred twenty-three".