1125161200 has 120 divisors (see below), whose sum is σ = 2793696192. Its totient is φ = 435240960.

The previous prime is 1125161159. The next prime is 1125161239. The reversal of 1125161200 is 21615211.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1823292 + ... + 1823908.

Almost surely, 2^1125161200 is an apocalyptic number.

1125161200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1125161200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1396848096).

1125161200 is an abundant number, since it is smaller than the sum of its proper divisors (1668534992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1125161200 is a wasteful number, since it uses less digits than its factorization.

1125161200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779 (or 768 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 1125161200 is about 33543.4226041410. The cubic root of 1125161200 is about 1040.0915846368.

Adding to 1125161200 its reverse (21615211), we get a palindrome (1146776411).

The spelling of 1125161200 in words is "one billion, one hundred twenty-five million, one hundred sixty-one thousand, two hundred".