1123155503 has 4 divisors (see below), whose sum is σ = 1124075088. Its totient is φ = 1122235920.

The previous prime is 1123155497. The next prime is 1123155547. The reversal of 1123155503 is 3055513211.

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 1123155503 - 2⁴ = 1123155487 is a prime.

It is a super-2 number, since 2×1123155503² = 2522956567838366018, 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 (1123155563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457958 + ... + 460403.

It is an arithmetic number, because the mean of its divisors is an integer number (281018772).

Almost surely, 2^1123155503 is an apocalyptic number.

1123155503 is a deficient number, since it is larger than the sum of its proper divisors (919585).

1123155503 is an equidigital number, since it uses as much as digits as its factorization.

1123155503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919584.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 1123155503 is about 33513.5122450632. The cubic root of 1123155503 is about 1039.4731993612.

Adding to 1123155503 its reverse (3055513211), we get a palindrome (4178668714).

The spelling of 1123155503 in words is "one billion, one hundred twenty-three million, one hundred fifty-five thousand, five hundred three".