1123813511 has 4 divisors (see below), whose sum is σ = 1172674992. Its totient is φ = 1074952032.

The previous prime is 1123813507. The next prime is 1123813531. The reversal of 1123813511 is 1153183211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1153183211 = 47 ⋅24535813.

It is a cyclic number.

It is not a de Polignac number, because 1123813511 - 2² = 1123813507 is a prime.

It is a super-2 number, since 2×1123813511² = 2525913615012294242, 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 (1123813531) 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 3 ways as a sum of consecutive naturals, for example, 24430706 + ... + 24430751.

It is an arithmetic number, because the mean of its divisors is an integer number (293168748).

Almost surely, 2^1123813511 is an apocalyptic number.

1123813511 is a deficient number, since it is larger than the sum of its proper divisors (48861481).

1123813511 is an equidigital number, since it uses as much as digits as its factorization.

1123813511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48861480.

The product of its digits is 720, while the sum is 26.

The square root of 1123813511 is about 33523.3278628480. The cubic root of 1123813511 is about 1039.6761537906.

Adding to 1123813511 its reverse (1153183211), we get a palindrome (2276996722).

The spelling of 1123813511 in words is "one billion, one hundred twenty-three million, eight hundred thirteen thousand, five hundred eleven".