1131993220 has 48 divisors (see below), whose sum is σ = 2397206448. Its totient is φ = 449003520.

The previous prime is 1131993217. The next prime is 1131993223. The reversal of 1131993220 is 223991311.

It is an interprime number because it is at equal distance from previous prime (1131993217) and next prime (1131993223).

It can be written as a sum of positive squares in 8 ways, for example, as 62441604 + 1069551616 = 7902^2 + 32704^2 .

It is not an unprimeable number, because it can be changed into a prime (1131993223) 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, 1961572 + ... + 1962148.

It is an arithmetic number, because the mean of its divisors is an integer number (49941801).

Almost surely, 2^1131993220 is an apocalyptic number.

1131993220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131993220 is an abundant number, since it is smaller than the sum of its proper divisors (1265213228).

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

1131993220 is a wasteful number, since it uses less digits than its factorization.

1131993220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240 (or 1238 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 1131993220 is about 33645.1069250790. The cubic root of 1131993220 is about 1042.1924961470.

The spelling of 1131993220 in words is "one billion, one hundred thirty-one million, nine hundred ninety-three thousand, two hundred twenty".