1091049444 has 18 divisors (see below), whose sum is σ = 2757930630. Its totient is φ = 363683136.

The previous prime is 1091049437. The next prime is 1091049457. The reversal of 1091049444 is 4449401901.

1091049444 is a `hidden beast` number, since 109 + 104 + 9 + 444 = 666.

It can be written as a sum of positive squares in only one way, i.e., 943718400 + 147331044 = 30720^2 + 12138^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 30306929 = 1091049444 / (1 + 0 + 9 + 1 + 0 + 4 + 9 + 4 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 1091049399 and 1091049408.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 15153429 + ... + 15153500.

Almost surely, 2^1091049444 is an apocalyptic number.

It is an amenable number.

1091049444 is an abundant number, since it is smaller than the sum of its proper divisors (1666881186).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1091049444 is a wasteful number, since it uses less digits than its factorization.

1091049444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30306939 (or 30306934 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 1091049444 is about 33031.0375858828. The cubic root of 1091049444 is about 1029.4726442344.

The spelling of 1091049444 in words is "one billion, ninety-one million, forty-nine thousand, four hundred forty-four".