1091794665 has 16 divisors (see below), whose sum is σ = 1881246528. Its totient is φ = 537498816.

The previous prime is 1091794661. The next prime is 1091794679. The reversal of 1091794665 is 5664971901.

It is a happy number.

It is not a de Polignac number, because 1091794665 - 2² = 1091794661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1091794661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2799279 + ... + 2799668.

It is an arithmetic number, because the mean of its divisors is an integer number (117577908).

Almost surely, 2^1091794665 is an apocalyptic number.

1091794665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1091794665 is a deficient number, since it is larger than the sum of its proper divisors (789451863).

1091794665 is a wasteful number, since it uses less digits than its factorization.

1091794665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5598968.

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 1091794665 is about 33042.3162777672. The cubic root of 1091794665 is about 1029.7069782613.

The spelling of 1091794665 in words is "one billion, ninety-one million, seven hundred ninety-four thousand, six hundred sixty-five".