1125551121 has 8 divisors (see below), whose sum is σ = 1501503360. Its totient is φ = 749983152.

The previous prime is 1125551117. The next prime is 1125551123. The reversal of 1125551121 is 1211555211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1125551121 - 2² = 1125551117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1125551091 and 1125551100.

It is not an unprimeable number, because it can be changed into a prime (1125551123) 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 7 ways as a sum of consecutive naturals, for example, 89161 + ... + 100998.

It is an arithmetic number, because the mean of its divisors is an integer number (187687920).

Almost surely, 2^1125551121 is an apocalyptic number.

It is an amenable number.

1125551121 is a deficient number, since it is larger than the sum of its proper divisors (375952239).

1125551121 is a wasteful number, since it uses less digits than its factorization.

1125551121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192135.

The product of its digits is 500, while the sum is 24.

The square root of 1125551121 is about 33549.2342833633. The cubic root of 1125551121 is about 1040.2117175600.

The spelling of 1125551121 in words is "one billion, one hundred twenty-five million, five hundred fifty-one thousand, one hundred twenty-one".