2173649 has 2 divisors, whose sum is σ = 2173650. Its totient is φ = 2173648.

The previous prime is 2173643. The next prime is 2173651. The reversal of 2173649 is 9463712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1890625 + 283024 = 1375^2 + 532^2 .

It is a cyclic number.

It is not a de Polignac number, because 2173649 - 2⁸ = 2173393 is a prime.

Together with 2173651, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2173643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086824 + 1086825.

It is an arithmetic number, because the mean of its divisors is an integer number (1086825).

2^2173649 is an apocalyptic number.

It is an amenable number.

2173649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2173649 is an equidigital number, since it uses as much as digits as its factorization.

2173649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 32.

The square root of 2173649 is about 1474.3300173299. The cubic root of 2173649 is about 129.5377865612.

The spelling of 2173649 in words is "two million, one hundred seventy-three thousand, six hundred forty-nine".