1121445503 has 4 divisors (see below), whose sum is σ = 1121513208. Its totient is φ = 1121377800.

The previous prime is 1121445499. The next prime is 1121445517. The reversal of 1121445503 is 3055441211.

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: 3055441211 = 293 ⋅10428127.

It is a cyclic number.

It is not a de Polignac number, because 1121445503 - 2² = 1121445499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121445583) 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, 9500 + ... + 48302.

It is an arithmetic number, because the mean of its divisors is an integer number (280378302).

Almost surely, 2^1121445503 is an apocalyptic number.

1121445503 is a deficient number, since it is larger than the sum of its proper divisors (67705).

1121445503 is an equidigital number, since it uses as much as digits as its factorization.

1121445503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67704.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1121445503 is about 33487.9904294062. The cubic root of 1121445503 is about 1038.9454000765.

Adding to 1121445503 its reverse (3055441211), we get a palindrome (4176886714).

The spelling of 1121445503 in words is "one billion, one hundred twenty-one million, four hundred forty-five thousand, five hundred three".