1131111223 has 4 divisors (see below), whose sum is σ = 1233939528. Its totient is φ = 1028282920.

The previous prime is 1131111217. The next prime is 1131111257. The reversal of 1131111223 is 3221111311.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1131111223 - 2⁹ = 1131110711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1131111197 and 1131111206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131111283) 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, 51414136 + ... + 51414157.

It is an arithmetic number, because the mean of its divisors is an integer number (308484882).

Almost surely, 2^1131111223 is an apocalyptic number.

1131111223 is a deficient number, since it is larger than the sum of its proper divisors (102828305).

1131111223 is a wasteful number, since it uses less digits than its factorization.

1131111223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102828304.

The product of its digits is 36, while the sum is 16.

The square root of 1131111223 is about 33631.9970117744. The cubic root of 1131111223 is about 1041.9217496803.

Adding to 1131111223 its reverse (3221111311), we get a palindrome (4352222534).

The spelling of 1131111223 in words is "one billion, one hundred thirty-one million, one hundred eleven thousand, two hundred twenty-three".