1131203120 has 80 divisors (see below), whose sum is σ = 2852817408. Its totient is φ = 415457280.

The previous prime is 1131203081. The next prime is 1131203123. The reversal of 1131203120 is 213021311.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 1131203095 and 1131203104.

It is not an unprimeable number, because it can be changed into a prime (1131203123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45617 + ... + 65903.

Almost surely, 2^1131203120 is an apocalyptic number.

1131203120 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 1131203120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1426408704).

1131203120 is an abundant number, since it is smaller than the sum of its proper divisors (1721614288).

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

1131203120 is a wasteful number, since it uses less digits than its factorization.

1131203120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20358 (or 20352 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1131203120 is about 33633.3631978724. The cubic root of 1131203120 is about 1041.9499658534.

Adding to 1131203120 its reverse (213021311), we get a palindrome (1344224431).

The spelling of 1131203120 in words is "one billion, one hundred thirty-one million, two hundred three thousand, one hundred twenty".