1125161280 has 280 divisors, whose sum is σ = 4058363232. Its totient is φ = 295861248.

The previous prime is 1125161251. The next prime is 1125161281. The reversal of 1125161280 is 821615211.

It is a super-2 number, since 2×1125161280² = 2531975812022476800, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125161281) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2151099 + ... + 2151621.

Almost surely, 2^1125161280 is an apocalyptic number.

1125161280 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 1125161280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2029181616).

1125161280 is an abundant number, since it is smaller than the sum of its proper divisors (2933201952).

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

1125161280 is an equidigital number, since it uses as much as digits as its factorization.

1125161280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635 (or 616 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The square root of 1125161280 is about 33543.4237966252. The cubic root of 1125161280 is about 1040.0916092873.

Adding to 1125161280 its reverse (821615211), we get a palindrome (1946776491).

The spelling of 1125161280 in words is "one billion, one hundred twenty-five million, one hundred sixty-one thousand, two hundred eighty".