2171279 has 4 divisors (see below), whose sum is σ = 2368680. Its totient is φ = 1973880.

The previous prime is 2171261. The next prime is 2171293. The reversal of 2171279 is 9721712.

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

It is a cyclic number.

It is not a de Polignac number, because 2171279 - 2¹² = 2167183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171219) 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, 98684 + ... + 98705.

It is an arithmetic number, because the mean of its divisors is an integer number (592170).

2^2171279 is an apocalyptic number.

2171279 is a deficient number, since it is larger than the sum of its proper divisors (197401).

2171279 is a wasteful number, since it uses less digits than its factorization.

2171279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197400.

The product of its digits is 1764, while the sum is 29.

The square root of 2171279 is about 1473.5260432039. The cubic root of 2171279 is about 129.4906896901.

The spelling of 2171279 in words is "two million, one hundred seventy-one thousand, two hundred seventy-nine".