1131643985 has 8 divisors (see below), whose sum is σ = 1358231976. Its totient is φ = 905142400.

The previous prime is 1131643979. The next prime is 1131643991. The reversal of 1131643985 is 5893461311.

It is an interprime number because it is at equal distance from previous prime (1131643979) and next prime (1131643991).

It can be written as a sum of positive squares in 4 ways, for example, as 58491904 + 1073152081 = 7648^2 + 32759^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1131643985 - 2²⁴ = 1114866769 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 11957 + ... + 49053.

It is an arithmetic number, because the mean of its divisors is an integer number (169778997).

Almost surely, 2^1131643985 is an apocalyptic number.

It is an amenable number.

1131643985 is a deficient number, since it is larger than the sum of its proper divisors (226587991).

1131643985 is an equidigital number, since it uses as much as digits as its factorization.

1131643985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43203.

The product of its digits is 77760, while the sum is 41.

The square root of 1131643985 is about 33639.9165427027. The cubic root of 1131643985 is about 1042.0853083635.

The spelling of 1131643985 in words is "one billion, one hundred thirty-one million, six hundred forty-three thousand, nine hundred eighty-five".