2061649 has 2 divisors, whose sum is σ = 2061650. Its totient is φ = 2061648.

The previous prime is 2061629. The next prime is 2061667. The reversal of 2061649 is 9461602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2050624 + 11025 = 1432^2 + 105^2 .

It is a cyclic number.

It is not a de Polignac number, because 2061649 - 2¹⁵ = 2028881 is a prime.

2061649 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2061629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1030824 + 1030825.

It is an arithmetic number, because the mean of its divisors is an integer number (1030825).

2^2061649 is an apocalyptic number.

It is an amenable number.

2061649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2061649 is an equidigital number, since it uses as much as digits as its factorization.

2061649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 2061649 is about 1435.8443508960. The cubic root of 2061649 is about 127.2735748088.

The spelling of 2061649 in words is "two million, sixty-one thousand, six hundred forty-nine".