1123121311 has 8 divisors (see below), whose sum is σ = 1213383920. Its totient is φ = 1033411392.

The previous prime is 1123121287. The next prime is 1123121333. The reversal of 1123121311 is 1131213211.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1123121311 - 2²¹ = 1121024159 is a prime.

It is a super-2 number, since 2×1123121311² = 2522802958444717442, 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 (1123121341) 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 7 ways as a sum of consecutive naturals, for example, 133941 + ... + 142078.

It is an arithmetic number, because the mean of its divisors is an integer number (151672990).

Almost surely, 2^1123121311 is an apocalyptic number.

1123121311 is a deficient number, since it is larger than the sum of its proper divisors (90262609).

1123121311 is a wasteful number, since it uses less digits than its factorization.

1123121311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276345.

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

The square root of 1123121311 is about 33513.0021185808. The cubic root of 1123121311 is about 1039.4626510954.

Adding to 1123121311 its reverse (1131213211), we get a palindrome (2254334522).

The spelling of 1123121311 in words is "one billion, one hundred twenty-three million, one hundred twenty-one thousand, three hundred eleven".