2171649 has 8 divisors (see below), whose sum is σ = 2913952. Its totient is φ = 1438560.

The previous prime is 2171639. The next prime is 2171657. The reversal of 2171649 is 9461712.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2171649 - 2⁴ = 2171633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2171639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1732 + ... + 2709.

It is an arithmetic number, because the mean of its divisors is an integer number (364244).

2^2171649 is an apocalyptic number.

It is an amenable number.

2171649 is a deficient number, since it is larger than the sum of its proper divisors (742303).

2171649 is a wasteful number, since it uses less digits than its factorization.

2171649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4607.

The product of its digits is 3024, while the sum is 30.

The square root of 2171649 is about 1473.6515870449. The cubic root of 2171649 is about 129.4980446230.

The spelling of 2171649 in words is "two million, one hundred seventy-one thousand, six hundred forty-nine".