2171928609 has 24 divisors (see below), whose sum is σ = 3208008960. Its totient is φ = 1415363328.

The previous prime is 2171928599. The next prime is 2171928611. The reversal of 2171928609 is 9068291712.

2171928609 is a `hidden beast` number, since 2 + 1 + 7 + 19 + 28 + 609 = 666.

It is not a de Polignac number, because 2171928609 - 2⁹ = 2171928097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2171928809) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 390204 + ... + 395730.

It is an arithmetic number, because the mean of its divisors is an integer number (133667040).

Almost surely, 2^2171928609 is an apocalyptic number.

It is an amenable number.

2171928609 is a deficient number, since it is larger than the sum of its proper divisors (1036080351).

2171928609 is a wasteful number, since it uses less digits than its factorization.

2171928609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6509 (or 6506 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 2171928609 is about 46603.9548643675. The cubic root of 2171928609 is about 1295.0360219156.

The spelling of 2171928609 in words is "two billion, one hundred seventy-one million, nine hundred twenty-eight thousand, six hundred nine".