1108445821 has 4 divisors (see below), whose sum is σ = 1266795232. Its totient is φ = 950096412.

The previous prime is 1108445809. The next prime is 1108445857. The reversal of 1108445821 is 1285448011.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 1108445821 - 2⁹ = 1108445309 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 (1108445861) 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 3 ways as a sum of consecutive naturals, for example, 79174695 + ... + 79174708.

It is an arithmetic number, because the mean of its divisors is an integer number (316698808).

Almost surely, 2^1108445821 is an apocalyptic number.

It is an amenable number.

1108445821 is a deficient number, since it is larger than the sum of its proper divisors (158349411).

1108445821 is an equidigital number, since it uses as much as digits as its factorization.

1108445821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158349410.

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 1108445821 is about 33293.3299776397. The cubic root of 1108445821 is about 1034.9153379682.

The spelling of 1108445821 in words is "one billion, one hundred eight million, four hundred forty-five thousand, eight hundred twenty-one".