1123005553 has 4 divisors (see below), whose sum is σ = 1133501040. Its totient is φ = 1112510068.

The previous prime is 1123005551. The next prime is 1123005563. The reversal of 1123005553 is 3555003211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3555003211 = 23 ⋅154565357.

It is a cyclic number.

It is not a de Polignac number, because 1123005553 - 2¹ = 1123005551 is a prime.

It is a super-2 number, since 2×1123005553² = 2522282944137671618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1123005551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5247583 + ... + 5247796.

It is an arithmetic number, because the mean of its divisors is an integer number (283375260).

Almost surely, 2^1123005553 is an apocalyptic number.

It is an amenable number.

1123005553 is a deficient number, since it is larger than the sum of its proper divisors (10495487).

1123005553 is a wasteful number, since it uses less digits than its factorization.

1123005553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10495486.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 1123005553 is about 33511.2750130460. The cubic root of 1123005553 is about 1039.4269380486.

Adding to 1123005553 its reverse (3555003211), we get a palindrome (4678008764).

The spelling of 1123005553 in words is "one billion, one hundred twenty-three million, five thousand, five hundred fifty-three".