2818649 has 2 divisors, whose sum is σ = 2818650. Its totient is φ = 2818648.

The previous prime is 2818643. The next prime is 2818657. The reversal of 2818649 is 9468182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2271049 + 547600 = 1507^2 + 740^2 .

It is a cyclic number.

It is not a de Polignac number, because 2818649 - 2⁸ = 2818393 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2818643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1409324 + 1409325.

It is an arithmetic number, because the mean of its divisors is an integer number (1409325).

2^2818649 is an apocalyptic number.

It is an amenable number.

2818649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2818649 is an equidigital number, since it uses as much as digits as its factorization.

2818649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 38.

The square root of 2818649 is about 1678.8832597891. The cubic root of 2818649 is about 141.2581993309.

The spelling of 2818649 in words is "two million, eight hundred eighteen thousand, six hundred forty-nine".