2170649 has 4 divisors (see below), whose sum is σ = 2337636. Its totient is φ = 2003664.

The previous prime is 2170643. The next prime is 2170657. The reversal of 2170649 is 9460712.

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

It can be written as a sum of positive squares in 2 ways, for example, as 462400 + 1708249 = 680^2 + 1307^2 .

It is not a de Polignac number, because 2170649 - 2⁸ = 2170393 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 (2170643) 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, 83474 + ... + 83499.

It is an arithmetic number, because the mean of its divisors is an integer number (584409).

2^2170649 is an apocalyptic number.

It is an amenable number.

2170649 is a deficient number, since it is larger than the sum of its proper divisors (166987).

2170649 is a wasteful number, since it uses less digits than its factorization.

2170649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166986.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 2170649 is about 1473.3122547512. The cubic root of 2170649 is about 129.4781645032.

The spelling of 2170649 in words is "two million, one hundred seventy thousand, six hundred forty-nine".