2106971691 has 8 divisors (see below), whose sum is σ = 3064686144. Its totient is φ = 1276952520.

The previous prime is 2106971689. The next prime is 2106971719. The reversal of 2106971691 is 1961796012.

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

It is not a de Polignac number, because 2106971691 - 2¹ = 2106971689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2106971621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31923781 + ... + 31923846.

It is an arithmetic number, because the mean of its divisors is an integer number (383085768).

Almost surely, 2^2106971691 is an apocalyptic number.

2106971691 is a deficient number, since it is larger than the sum of its proper divisors (957714453).

2106971691 is a wasteful number, since it uses less digits than its factorization.

2106971691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63847641.

The product of its (nonzero) digits is 40824, while the sum is 42.

The square root of 2106971691 is about 45901.7613060763. The cubic root of 2106971691 is about 1281.9947111395.

The spelling of 2106971691 in words is "two billion, one hundred six million, nine hundred seventy-one thousand, six hundred ninety-one".