1123115553 has 24 divisors (see below), whose sum is σ = 1934644608. Its totient is φ = 613876032.

The previous prime is 1123115537. The next prime is 1123115561. The reversal of 1123115553 is 3555113211.

It is not a de Polignac number, because 1123115553 - 2⁴ = 1123115537 is a prime.

It is a super-2 number, since 2×1123115553² = 2522777090780991618, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1123115153) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 386100 + ... + 388997.

It is an arithmetic number, because the mean of its divisors is an integer number (80610192).

Almost surely, 2^1123115553 is an apocalyptic number.

It is an amenable number.

1123115553 is a deficient number, since it is larger than the sum of its proper divisors (811529055).

1123115553 is a wasteful number, since it uses less digits than its factorization.

1123115553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775133 (or 775130 counting only the distinct ones).

The product of its digits is 2250, while the sum is 27.

The square root of 1123115553 is about 33512.9162115146. The cubic root of 1123115553 is about 1039.4608747256.

Adding to 1123115553 its reverse (3555113211), we get a palindrome (4678228764).

The spelling of 1123115553 in words is "one billion, one hundred twenty-three million, one hundred fifteen thousand, five hundred fifty-three".