1131531375 has 32 divisors (see below), whose sum is σ = 2027712960. Its totient is φ = 557059200.

The previous prime is 1131531347. The next prime is 1131531389. The reversal of 1131531375 is 5731351311.

It is a happy number.

It is not a de Polignac number, because 1131531375 - 2²⁶ = 1064422511 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111180 + ... + 120929.

It is an arithmetic number, because the mean of its divisors is an integer number (63366030).

Almost surely, 2^1131531375 is an apocalyptic number.

1131531375 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1131531375 is a deficient number, since it is larger than the sum of its proper divisors (896181585).

1131531375 is a wasteful number, since it uses less digits than its factorization.

1131531375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232140 (or 232130 counting only the distinct ones).

The product of its digits is 4725, while the sum is 30.

The square root of 1131531375 is about 33638.2427454230. The cubic root of 1131531375 is about 1042.0507412143.

Adding to 1131531375 its reverse (5731351311), we get a palindrome (6862882686).

The spelling of 1131531375 in words is "one billion, one hundred thirty-one million, five hundred thirty-one thousand, three hundred seventy-five".