2168091971 has 8 divisors (see below), whose sum is σ = 2193008400. Its totient is φ = 2143316448.

The previous prime is 2168091929. The next prime is 2168091979. The reversal of 2168091971 is 1791908612.

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 2168091971 - 2⁶ = 2168091907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2168091979) 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, 4121 + ... + 65978.

It is an arithmetic number, because the mean of its divisors is an integer number (274126050).

Almost surely, 2^2168091971 is an apocalyptic number.

2168091971 is a deficient number, since it is larger than the sum of its proper divisors (24916429).

2168091971 is a wasteful number, since it uses less digits than its factorization.

2168091971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70453.

The product of its (nonzero) digits is 54432, while the sum is 44.

The square root of 2168091971 is about 46562.7745199961. The cubic root of 2168091971 is about 1294.2730267786.

The spelling of 2168091971 in words is "two billion, one hundred sixty-eight million, ninety-one thousand, nine hundred seventy-one".