1109749421 has 16 divisors (see below), whose sum is σ = 1220616960. Its totient is φ = 1000581120.

The previous prime is 1109749411. The next prime is 1109749429. The reversal of 1109749421 is 1249479011.

It is not a de Polignac number, because 1109749421 - 2⁶ = 1109749357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1109749429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 982385 + ... + 983513.

It is an arithmetic number, because the mean of its divisors is an integer number (76288560).

Almost surely, 2^1109749421 is an apocalyptic number.

1109749421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1109749421 is a deficient number, since it is larger than the sum of its proper divisors (110867539).

1109749421 is a wasteful number, since it uses less digits than its factorization.

1109749421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1796.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 1109749421 is about 33312.9017199043. The cubic root of 1109749421 is about 1035.3208869130.

The spelling of 1109749421 in words is "one billion, one hundred nine million, seven hundred forty-nine thousand, four hundred twenty-one".