2117171686 has 32 divisors (see below), whose sum is σ = 3652766208. Its totient is φ = 901549440.

The previous prime is 2117171681. The next prime is 2117171699. The reversal of 2117171686 is 6861717112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2117171681) 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 15 ways as a sum of consecutive naturals, for example, 1884721 + ... + 1885843.

It is an arithmetic number, because the mean of its divisors is an integer number (114148944).

Almost surely, 2^2117171686 is an apocalyptic number.

2117171686 is a deficient number, since it is larger than the sum of its proper divisors (1535594522).

2117171686 is a wasteful number, since it uses less digits than its factorization.

2117171686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1876.

The product of its digits is 28224, while the sum is 40.

The square root of 2117171686 is about 46012.7339548521. The cubic root of 2117171686 is about 1284.0601233319.

Adding to 2117171686 its reverse (6861717112), we get a palindrome (8978888798).

The spelling of 2117171686 in words is "two billion, one hundred seventeen million, one hundred seventy-one thousand, six hundred eighty-six".