2920649 has 2 divisors, whose sum is σ = 2920650. Its totient is φ = 2920648.

The previous prime is 2920637. The next prime is 2920691. The reversal of 2920649 is 9460292.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2155024 + 765625 = 1468^2 + 875^2 .

It is a cyclic number.

It is not a de Polignac number, because 2920649 - 2⁴ = 2920633 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2920249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1460324 + 1460325.

It is an arithmetic number, because the mean of its divisors is an integer number (1460325).

2^2920649 is an apocalyptic number.

It is an amenable number.

2920649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2920649 is an equidigital number, since it uses as much as digits as its factorization.

2920649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 2920649 is about 1708.9906377742. The cubic root of 2920649 is about 142.9419785152.

Adding to 2920649 its sum of digits (32), we get a square (2920681 = 1709²).

The spelling of 2920649 in words is "two million, nine hundred twenty thousand, six hundred forty-nine".