2091147717 has 8 divisors (see below), whose sum is σ = 2788460640. Its totient is φ = 1393966640.

The previous prime is 2091147697. The next prime is 2091147731. The reversal of 2091147717 is 7177411902.

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 2091147717 - 2⁷ = 2091147589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091147757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13342 + ... + 66032.

It is an arithmetic number, because the mean of its divisors is an integer number (348557580).

Almost surely, 2^2091147717 is an apocalyptic number.

It is an amenable number.

2091147717 is a deficient number, since it is larger than the sum of its proper divisors (697312923).

2091147717 is a wasteful number, since it uses less digits than its factorization.

2091147717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65923.

The product of its (nonzero) digits is 24696, while the sum is 39.

The square root of 2091147717 is about 45729.0686216109. The cubic root of 2091147717 is about 1278.7772578227. Note that the first 3 decimals are identical.

The spelling of 2091147717 in words is "two billion, ninety-one million, one hundred forty-seven thousand, seven hundred seventeen".