1123111213 has 12 divisors (see below), whose sum is σ = 1319417532. Its totient is φ = 953131200.

The previous prime is 1123111207. The next prime is 1123111267. The reversal of 1123111213 is 3121113211.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1101376969 + 21734244 = 33187^2 + 4662^2 .

It is not a de Polignac number, because 1123111213 - 2²⁵ = 1089556781 is a prime.

It is a super-2 number, since 2×1123111213² = 2522757593532662738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123111313) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108520 + ... + 118417.

It is an arithmetic number, because the mean of its divisors is an integer number (109951461).

Almost surely, 2^1123111213 is an apocalyptic number.

It is an amenable number.

1123111213 is a deficient number, since it is larger than the sum of its proper divisors (196306319).

1123111213 is a wasteful number, since it uses less digits than its factorization.

1123111213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227052 (or 227045 counting only the distinct ones).

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

The square root of 1123111213 is about 33512.8514602980. The cubic root of 1123111213 is about 1039.4595358115.

Adding to 1123111213 its reverse (3121113211), we get a palindrome (4244224424).

The spelling of 1123111213 in words is "one billion, one hundred twenty-three million, one hundred eleven thousand, two hundred thirteen".