1131240320 has 64 divisors (see below), whose sum is σ = 3090722400. Its totient is φ = 387852288.

The previous prime is 1131240317. The next prime is 1131240329. The reversal of 1131240320 is 230421311.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131240329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121775 + ... + 130734.

Almost surely, 2^1131240320 is an apocalyptic number.

1131240320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131240320 is an abundant number, since it is smaller than the sum of its proper divisors (1959482080).

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

1131240320 is an equidigital number, since it uses as much as digits as its factorization.

1131240320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252535 (or 252523 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1131240320 is about 33633.9162156297. The cubic root of 1131240320 is about 1041.9613873547.

Adding to 1131240320 its reverse (230421311), we get a palindrome (1361661631).

The spelling of 1131240320 in words is "one billion, one hundred thirty-one million, two hundred forty thousand, three hundred twenty".