2117172506 has 16 divisors (see below), whose sum is σ = 3230660040. Its totient is φ = 1040316480.

The previous prime is 2117172493. The next prime is 2117172511. The reversal of 2117172506 is 6052717112.

It can be written as a sum of positive squares in 4 ways, for example, as 868186225 + 1248986281 = 29465^2 + 35341^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143900 + ... + 157928.

Almost surely, 2^2117172506 is an apocalyptic number.

2117172506 is a deficient number, since it is larger than the sum of its proper divisors (1113487534).

2117172506 is a wasteful number, since it uses less digits than its factorization.

2117172506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15329.

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 2117172506 is about 46012.7428654281. The cubic root of 2117172506 is about 1284.0602891079.

Adding to 2117172506 its reverse (6052717112), we get a palindrome (8169889618).

It can be divided in two parts, 211 and 7172506, that added together give a palindrome (7172717).

The spelling of 2117172506 in words is "two billion, one hundred seventeen million, one hundred seventy-two thousand, five hundred six".