1089997849 has 4 divisors (see below), whose sum is σ = 1090992564. Its totient is φ = 1089003136.

The previous prime is 1089997819. The next prime is 1089997873. The reversal of 1089997849 is 9487999801.

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 185913225 + 904084624 = 13635^2 + 30068^2 .

It is a cyclic number.

It is not a de Polignac number, because 1089997849 - 2²⁵ = 1056443417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1089997819) 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, 495712 + ... + 497905.

It is an arithmetic number, because the mean of its divisors is an integer number (272748141).

Almost surely, 2^1089997849 is an apocalyptic number.

It is an amenable number.

1089997849 is a deficient number, since it is larger than the sum of its proper divisors (994715).

1089997849 is an equidigital number, since it uses as much as digits as its factorization.

1089997849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994714.

The product of its (nonzero) digits is 11757312, while the sum is 64.

The square root of 1089997849 is about 33015.1154624666. The cubic root of 1089997849 is about 1029.1417896030.

The spelling of 1089997849 in words is "one billion, eighty-nine million, nine hundred ninety-seven thousand, eight hundred forty-nine".