1155113023 has 4 divisors (see below), whose sum is σ = 1155181240. Its totient is φ = 1155044808.

The previous prime is 1155113021. The next prime is 1155113053. The reversal of 1155113023 is 3203115511.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3203115511 = 29 ⋅110452259.

It is a cyclic number.

It is not a de Polignac number, because 1155113023 - 2¹ = 1155113021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1155112985 and 1155113003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155113021) 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, 12748 + ... + 49726.

It is an arithmetic number, because the mean of its divisors is an integer number (288795310).

Almost surely, 2^1155113023 is an apocalyptic number.

1155113023 is a deficient number, since it is larger than the sum of its proper divisors (68217).

1155113023 is an equidigital number, since it uses as much as digits as its factorization.

1155113023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68216.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 1155113023 is about 33986.9537175664. The cubic root of 1155113023 is about 1049.2399709327.

Adding to 1155113023 its reverse (3203115511), we get a palindrome (4358228534).

The spelling of 1155113023 in words is "one billion, one hundred fifty-five million, one hundred thirteen thousand, twenty-three".