1089649569 has 4 divisors (see below), whose sum is σ = 1452866096. Its totient is φ = 726433044.

The previous prime is 1089649559. The next prime is 1089649577. The reversal of 1089649569 is 9659469801.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1089649569 - 2⁷ = 1089649441 is a prime.

It is a super-2 number, since 2×1089649569² = 2374672366443771522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1089649549) 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, 181608259 + ... + 181608264.

It is an arithmetic number, because the mean of its divisors is an integer number (363216524).

Almost surely, 2^1089649569 is an apocalyptic number.

It is an amenable number.

1089649569 is a deficient number, since it is larger than the sum of its proper divisors (363216527).

1089649569 is an equidigital number, since it uses as much as digits as its factorization.

1089649569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363216526.

The product of its (nonzero) digits is 4199040, while the sum is 57.

The square root of 1089649569 is about 33009.8404873456. The cubic root of 1089649569 is about 1029.0321662415.

The spelling of 1089649569 in words is "one billion, eighty-nine million, six hundred forty-nine thousand, five hundred sixty-nine".