1131043987 has 4 divisors (see below), whose sum is σ = 1146974256. Its totient is φ = 1115113720.

The previous prime is 1131043981. The next prime is 1131043997. The reversal of 1131043987 is 7893401311.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1131043987 - 2¹⁹ = 1130519699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131043981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7965028 + ... + 7965169.

It is an arithmetic number, because the mean of its divisors is an integer number (286743564).

Almost surely, 2^1131043987 is an apocalyptic number.

1131043987 is a deficient number, since it is larger than the sum of its proper divisors (15930269).

1131043987 is an equidigital number, since it uses as much as digits as its factorization.

1131043987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15930268.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 1131043987 is about 33630.9974131009. The cubic root of 1131043987 is about 1041.9011044842.

The spelling of 1131043987 in words is "one billion, one hundred thirty-one million, forty-three thousand, nine hundred eighty-seven".