1109891221 has 8 divisors (see below), whose sum is σ = 1114378560. Its totient is φ = 1105412352.

The previous prime is 1109891207. The next prime is 1109891239. The reversal of 1109891221 is 1221989011.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1109891221 - 2¹⁷ = 1109760149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1109891201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401781 + ... + 404533.

It is an arithmetic number, because the mean of its divisors is an integer number (139297320).

Almost surely, 2^1109891221 is an apocalyptic number.

It is an amenable number.

1109891221 is a deficient number, since it is larger than the sum of its proper divisors (4487339).

1109891221 is a wasteful number, since it uses less digits than its factorization.

1109891221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4235.

The product of its (nonzero) digits is 2592, while the sum is 34.

The square root of 1109891221 is about 33315.0299564626. The cubic root of 1109891221 is about 1035.3649816268.

The spelling of 1109891221 in words is "one billion, one hundred nine million, eight hundred ninety-one thousand, two hundred twenty-one".