1091604004 has 12 divisors (see below), whose sum is σ = 1910596464. Its totient is φ = 545719304.

The previous prime is 1091604001. The next prime is 1091604011. The reversal of 1091604004 is 4004061901.

It is a self number, because there is not a number n which added to its sum of digits gives 1091604004.

It is not an unprimeable number, because it can be changed into a prime (1091604001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16419 + ... + 49525.

It is an arithmetic number, because the mean of its divisors is an integer number (159216372).

Almost surely, 2^1091604004 is an apocalyptic number.

It is an amenable number.

1091604004 is a deficient number, since it is larger than the sum of its proper divisors (818992460).

1091604004 is a wasteful number, since it uses less digits than its factorization.

1091604004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41354 (or 41352 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1091604004 is about 33039.4310483701. The cubic root of 1091604004 is about 1029.6470352465.

Adding to 1091604004 its reverse (4004061901), we get a palindrome (5095665905).

The spelling of 1091604004 in words is "one billion, ninety-one million, six hundred four thousand, four".