1109725821 has 24 divisors (see below), whose sum is σ = 1618344000. Its totient is φ = 732733632.

The previous prime is 1109725807. The next prime is 1109725829. The reversal of 1109725821 is 1285279011.

It is a happy number.

1109725821 is a `hidden beast` number, since 1 + 1 + 0 + 9 + 72 + 582 + 1 = 666.

It is not a de Polignac number, because 1109725821 - 2¹⁴ = 1109709437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1109725829) 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 23 ways as a sum of consecutive naturals, for example, 711040 + ... + 712598.

It is an arithmetic number, because the mean of its divisors is an integer number (67431000).

Almost surely, 2^1109725821 is an apocalyptic number.

It is an amenable number.

1109725821 is a deficient number, since it is larger than the sum of its proper divisors (508618179).

1109725821 is a wasteful number, since it uses less digits than its factorization.

1109725821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2273 (or 2270 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 36.

The square root of 1109725821 is about 33312.5475009042. The cubic root of 1109725821 is about 1035.3135477949.

The spelling of 1109725821 in words is "one billion, one hundred nine million, seven hundred twenty-five thousand, eight hundred twenty-one".