2171663 has 4 divisors (see below), whose sum is σ = 2338728. Its totient is φ = 2004600.

The previous prime is 2171657. The next prime is 2171707. The reversal of 2171663 is 3661712.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2171663 - 2⁶ = 2171599 is a prime.

It is a super-2 number, since 2×2171663² = 9432240371138, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a zygodrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83513 + ... + 83538.

It is an arithmetic number, because the mean of its divisors is an integer number (584682).

2^2171663 is an apocalyptic number.

2171663 is a deficient number, since it is larger than the sum of its proper divisors (167065).

2171663 is a wasteful number, since it uses less digits than its factorization.

2171663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167064.

The product of its digits is 1512, while the sum is 26.

The square root of 2171663 is about 1473.6563371424. The cubic root of 2171663 is about 129.4983229013.

The spelling of 2171663 in words is "two million, one hundred seventy-one thousand, six hundred sixty-three".