2171309249 has 4 divisors (see below), whose sum is σ = 2171490240. Its totient is φ = 2171128260.

The previous prime is 2171309219. The next prime is 2171309269. The reversal of 2171309249 is 9429031712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2171309249 - 2¹² = 2171305153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2171309219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71117 + ... + 96954.

It is an arithmetic number, because the mean of its divisors is an integer number (542872560).

Almost surely, 2^2171309249 is an apocalyptic number.

It is an amenable number.

2171309249 is a deficient number, since it is larger than the sum of its proper divisors (180991).

2171309249 is a wasteful number, since it uses less digits than its factorization.

2171309249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180990.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 2171309249 is about 46597.3094609549. The cubic root of 2171309249 is about 1294.9129101702.

The spelling of 2171309249 in words is "two billion, one hundred seventy-one million, three hundred nine thousand, two hundred forty-nine".