1089864289 has 4 divisors (see below), whose sum is σ = 1089936324. Its totient is φ = 1089792256.

The previous prime is 1089864253. The next prime is 1089864319. The reversal of 1089864289 is 9824689801.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 270931600 + 818932689 = 16460^2 + 28617^2 .

It is a cyclic number.

It is not a de Polignac number, because 1089864289 - 2¹⁵ = 1089831521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1089864239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3592 + ... + 46825.

It is an arithmetic number, because the mean of its divisors is an integer number (272484081).

Almost surely, 2^1089864289 is an apocalyptic number.

It is an amenable number.

1089864289 is a deficient number, since it is larger than the sum of its proper divisors (72035).

1089864289 is an equidigital number, since it uses as much as digits as its factorization.

1089864289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72034.

The product of its (nonzero) digits is 1990656, while the sum is 55.

The square root of 1089864289 is about 33013.0926906281. The cubic root of 1089864289 is about 1029.0997534981.

The spelling of 1089864289 in words is "one billion, eighty-nine million, eight hundred sixty-four thousand, two hundred eighty-nine".