1111123213 has 6 divisors (see below), whose sum is σ = 1180328426. Its totient is φ = 1045762752.

The previous prime is 1111123201. The next prime is 1111123271. The reversal of 1111123213 is 3123211111.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 287031364 + 824091849 = 16942^2 + 28707^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1111123213 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 (1111123613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1922070 + ... + 1922647.

Almost surely, 2^1111123213 is an apocalyptic number.

It is an amenable number.

1111123213 is a deficient number, since it is larger than the sum of its proper divisors (69205213).

1111123213 is an equidigital number, since it uses as much as digits as its factorization.

1111123213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3844751 (or 3844734 counting only the distinct ones).

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

The square root of 1111123213 is about 33333.5148611724. The cubic root of 1111123213 is about 1035.7479289759.

Adding to 1111123213 its reverse (3123211111), we get a palindrome (4234334324).

The spelling of 1111123213 in words is "one billion, one hundred eleven million, one hundred twenty-three thousand, two hundred thirteen".