1121056003 has 4 divisors (see below), whose sum is σ = 1121298088. Its totient is φ = 1120813920.

The previous prime is 1121055997. The next prime is 1121056009. The reversal of 1121056003 is 3006501211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3006501211 = 7 ⋅429500173.

It is an interprime number because it is at equal distance from previous prime (1121055997) and next prime (1121056009).

It is a cyclic number.

It is not a de Polignac number, because 1121056003 - 2⁹ = 1121055491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121056009) 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, 113958 + ... + 123403.

It is an arithmetic number, because the mean of its divisors is an integer number (280324522).

Almost surely, 2^1121056003 is an apocalyptic number.

1121056003 is a deficient number, since it is larger than the sum of its proper divisors (242085).

1121056003 is an equidigital number, since it uses as much as digits as its factorization.

1121056003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242084.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1121056003 is about 33482.1744066899. The cubic root of 1121056003 is about 1038.8251041159.

Adding to 1121056003 its reverse (3006501211), we get a palindrome (4127557214).

The spelling of 1121056003 in words is "one billion, one hundred twenty-one million, fifty-six thousand, three".