1125544155 has 16 divisors (see below), whose sum is σ = 1810206240. Its totient is φ = 597178368.

The previous prime is 1125544081. The next prime is 1125544157. The reversal of 1125544155 is 5514455211.

It is a happy number.

It is not a de Polignac number, because 1125544155 - 2¹⁰ = 1125543131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1125544157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191500 + ... + 197289.

It is an arithmetic number, because the mean of its divisors is an integer number (113137890).

Almost surely, 2^1125544155 is an apocalyptic number.

1125544155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1125544155 is a deficient number, since it is larger than the sum of its proper divisors (684662085).

1125544155 is a wasteful number, since it uses less digits than its factorization.

1125544155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388990.

The product of its digits is 20000, while the sum is 33.

The square root of 1125544155 is about 33549.1304656320. The cubic root of 1125544155 is about 1040.2095716098.

Adding to 1125544155 its reverse (5514455211), we get a palindrome (6639999366).

The spelling of 1125544155 in words is "one billion, one hundred twenty-five million, five hundred forty-four thousand, one hundred fifty-five".