2185649 has 2 divisors, whose sum is σ = 2185650. Its totient is φ = 2185648.

The previous prime is 2185637. The next prime is 2185657. The reversal of 2185649 is 9465812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2155024 + 30625 = 1468^2 + 175^2 .

It is a cyclic number.

It is not a de Polignac number, because 2185649 - 2¹⁶ = 2120113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2185619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1092824 + 1092825.

It is an arithmetic number, because the mean of its divisors is an integer number (1092825).

2^2185649 is an apocalyptic number.

It is an amenable number.

2185649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2185649 is an equidigital number, since it uses as much as digits as its factorization.

2185649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 35.

The square root of 2185649 is about 1478.3940611353. The cubic root of 2185649 is about 129.7757277128.

The spelling of 2185649 in words is "two million, one hundred eighty-five thousand, six hundred forty-nine".