1089155889 has 28 divisors (see below), whose sum is σ = 1648366416. Its totient is φ = 719266392.

The previous prime is 1089155789. The next prime is 1089155909. The reversal of 1089155889 is 9885519801.

1089155889 is a `hidden beast` number, since 1 + 0 + 8 + 9 + 1 + 558 + 89 = 666.

It is not a de Polignac number, because 1089155889 - 2⁹ = 1089155377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1089155689) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 71022 + ... + 84984.

Almost surely, 2^1089155889 is an apocalyptic number.

It is an amenable number.

1089155889 is a deficient number, since it is larger than the sum of its proper divisors (559210527).

1089155889 is an equidigital number, since it uses as much as digits as its factorization.

1089155889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14088 (or 14073 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 54.

The square root of 1089155889 is about 33002.3618700238. The cubic root of 1089155889 is about 1028.8767372687.

The spelling of 1089155889 in words is "one billion, eighty-nine million, one hundred fifty-five thousand, eight hundred eighty-nine".