2947649 has 2 divisors, whose sum is σ = 2947650. Its totient is φ = 2947648.

The previous prime is 2947621. The next prime is 2947661. The reversal of 2947649 is 9467492.

2947649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2347024 + 600625 = 1532^2 + 775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2947649 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2947669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1473824 + 1473825.

It is an arithmetic number, because the mean of its divisors is an integer number (1473825).

2^2947649 is an apocalyptic number.

It is an amenable number.

2947649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2947649 is an equidigital number, since it uses as much as digits as its factorization.

2947649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 41.

The square root of 2947649 is about 1716.8718647587. The cubic root of 2947649 is about 143.3811048024.

The spelling of 2947649 in words is "two million, nine hundred forty-seven thousand, six hundred forty-nine".