1091791689 has 8 divisors (see below), whose sum is σ = 1465492800. Its totient is φ = 722975856.

The previous prime is 1091791667. The next prime is 1091791693. The reversal of 1091791689 is 9861971901.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1091791689 - 2¹¹ = 1091789641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1091791609) 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 7 ways as a sum of consecutive naturals, for example, 1220797 + ... + 1221690.

It is an arithmetic number, because the mean of its divisors is an integer number (183186600).

Almost surely, 2^1091791689 is an apocalyptic number.

It is an amenable number.

1091791689 is a deficient number, since it is larger than the sum of its proper divisors (373701111).

1091791689 is a wasteful number, since it uses less digits than its factorization.

1091791689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2442639.

The product of its (nonzero) digits is 244944, while the sum is 51.

The square root of 1091791689 is about 33042.2712445740. The cubic root of 1091791689 is about 1029.7060426731.

The spelling of 1091791689 in words is "one billion, ninety-one million, seven hundred ninety-one thousand, six hundred eighty-nine".