1091666291 has 8 divisors (see below), whose sum is σ = 1099332000. Its totient is φ = 1084027840.

The previous prime is 1091666269. The next prime is 1091666341. The reversal of 1091666291 is 1926661901.

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

It is a cyclic number.

It is not a de Polignac number, because 1091666291 - 2¹⁴ = 1091649907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1091666201) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 77135 + ... + 90183.

It is an arithmetic number, because the mean of its divisors is an integer number (137416500).

Almost surely, 2^1091666291 is an apocalyptic number.

1091666291 is a deficient number, since it is larger than the sum of its proper divisors (7665709).

1091666291 is a wasteful number, since it uses less digits than its factorization.

1091666291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13629.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 1091666291 is about 33040.3736510349. The cubic root of 1091666291 is about 1029.6666187844. Note that the first 4 decimals are identical.

The spelling of 1091666291 in words is "one billion, ninety-one million, six hundred sixty-six thousand, two hundred ninety-one".