2811649 has 2 divisors, whose sum is σ = 2811650. Its totient is φ = 2811648.

The previous prime is 2811631. The next prime is 2811659. The reversal of 2811649 is 9461182.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2663424 + 148225 = 1632^2 + 385^2 .

It is a cyclic number.

It is not a de Polignac number, because 2811649 - 2⁵ = 2811617 is a prime.

2811649 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2811649.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2811619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1405824 + 1405825.

It is an arithmetic number, because the mean of its divisors is an integer number (1405825).

2^2811649 is an apocalyptic number.

It is an amenable number.

2811649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2811649 is an equidigital number, since it uses as much as digits as its factorization.

2811649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 31.

The square root of 2811649 is about 1676.7972447496. The cubic root of 2811649 is about 141.1411660665.

The spelling of 2811649 in words is "two million, eight hundred eleven thousand, six hundred forty-nine".