2821649 has 2 divisors, whose sum is σ = 2821650. Its totient is φ = 2821648.

The previous prime is 2821627. The next prime is 2821681. The reversal of 2821649 is 9461282.

It is an a-pointer prime, because the next prime (2821681) can be obtained adding 2821649 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2755600 + 66049 = 1660^2 + 257^2 .

It is a cyclic number.

It is not a de Polignac number, because 2821649 - 2⁸ = 2821393 is a prime.

It is not a weakly prime, because it can be changed into another prime (2821699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1410824 + 1410825.

It is an arithmetic number, because the mean of its divisors is an integer number (1410825).

2^2821649 is an apocalyptic number.

It is an amenable number.

2821649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2821649 is an equidigital number, since it uses as much as digits as its factorization.

2821649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 32.

The square root of 2821649 is about 1679.7764732249. The cubic root of 2821649 is about 141.3082971307.

The spelling of 2821649 in words is "two million, eight hundred twenty-one thousand, six hundred forty-nine".