1089543985 has 4 divisors (see below), whose sum is σ = 1307452788. Its totient is φ = 871635184.

The previous prime is 1089543977. The next prime is 1089544021. The reversal of 1089543985 is 5893459801.

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

It can be written as a sum of positive squares in 2 ways, for example, as 727326961 + 362217024 = 26969^2 + 19032^2 .

It is a cyclic number.

It is not a de Polignac number, because 1089543985 - 2³ = 1089543977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108954394 + ... + 108954403.

It is an arithmetic number, because the mean of its divisors is an integer number (326863197).

Almost surely, 2^1089543985 is an apocalyptic number.

It is an amenable number.

1089543985 is a deficient number, since it is larger than the sum of its proper divisors (217908803).

1089543985 is an equidigital number, since it uses as much as digits as its factorization.

1089543985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217908802.

The product of its (nonzero) digits is 1555200, while the sum is 52.

The square root of 1089543985 is about 33008.2411679265. The cubic root of 1089543985 is about 1028.9989283869.

The spelling of 1089543985 in words is "one billion, eighty-nine million, five hundred forty-three thousand, nine hundred eighty-five".