1125455121 has 16 divisors (see below), whose sum is σ = 1905532800. Its totient is φ = 643117104.

The previous prime is 1125455099. The next prime is 1125455129. The reversal of 1125455121 is 1215545211.

It is a happy number.

1125455121 is a `hidden beast` number, since 112 + 545 + 5 + 1 + 2 + 1 = 666.

It is not a de Polignac number, because 1125455121 - 2¹⁰ = 1125454097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1125455129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2977206 + ... + 2977583.

It is an arithmetic number, because the mean of its divisors is an integer number (119095800).

Almost surely, 2^1125455121 is an apocalyptic number.

It is an amenable number.

1125455121 is a deficient number, since it is larger than the sum of its proper divisors (780077679).

1125455121 is an equidigital number, since it uses as much as digits as its factorization.

1125455121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5954805 (or 5954799 counting only the distinct ones).

The product of its digits is 2000, while the sum is 27.

The square root of 1125455121 is about 33547.8035197537. The cubic root of 1125455121 is about 1040.1821429625.

The spelling of 1125455121 in words is "one billion, one hundred twenty-five million, four hundred fifty-five thousand, one hundred twenty-one".