1131837985 has 8 divisors (see below), whose sum is σ = 1438100136. Its totient is φ = 852207360.

The previous prime is 1131837983. The next prime is 1131837997. The reversal of 1131837985 is 5897381311.

It can be written as a sum of positive squares in 4 ways, for example, as 30129121 + 1101708864 = 5489^2 + 33192^2 .

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

It is not a de Polignac number, because 1131837985 - 2¹ = 1131837983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131837983) 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, 6657786 + ... + 6657955.

It is an arithmetic number, because the mean of its divisors is an integer number (179762517).

Almost surely, 2^1131837985 is an apocalyptic number.

It is an amenable number.

1131837985 is a deficient number, since it is larger than the sum of its proper divisors (306262151).

1131837985 is a wasteful number, since it uses less digits than its factorization.

1131837985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13315763.

The product of its digits is 181440, while the sum is 46.

The square root of 1131837985 is about 33642.7998983438. The cubic root of 1131837985 is about 1042.1448538864.

The spelling of 1131837985 in words is "one billion, one hundred thirty-one million, eight hundred thirty-seven thousand, nine hundred eighty-five".