1123011311 has 4 divisors (see below), whose sum is σ = 1130448624. Its totient is φ = 1115574000.

The previous prime is 1123011299. The next prime is 1123011319. The reversal of 1123011311 is 1131103211.

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 1123011311 - 2¹⁸ = 1122749167 is a prime.

It is a super-4 number, since 4×1123011311⁴ (a number of 37 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123011319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3718430 + ... + 3718731.

It is an arithmetic number, because the mean of its divisors is an integer number (282612156).

Almost surely, 2^1123011311 is an apocalyptic number.

1123011311 is a deficient number, since it is larger than the sum of its proper divisors (7437313).

1123011311 is an equidigital number, since it uses as much as digits as its factorization.

1123011311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7437312.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1123011311 is about 33511.3609243194. The cubic root of 1123011311 is about 1039.4287145344.

Adding to 1123011311 its reverse (1131103211), we get a palindrome (2254114522).

The spelling of 1123011311 in words is "one billion, one hundred twenty-three million, eleven thousand, three hundred eleven".