2081779 has 4 divisors (see below), whose sum is σ = 2379184. Its totient is φ = 1784376.

The previous prime is 2081777. The next prime is 2081797. The reversal of 2081779 is 9771802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9771802 = 2 ⋅4885901.

It is a cyclic number.

It is not a de Polignac number, because 2081779 - 2¹ = 2081777 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (2081777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148692 + ... + 148705.

It is an arithmetic number, because the mean of its divisors is an integer number (594796).

2^2081779 is an apocalyptic number.

2081779 is a deficient number, since it is larger than the sum of its proper divisors (297405).

2081779 is an equidigital number, since it uses as much as digits as its factorization.

2081779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297404.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 2081779 is about 1442.8371356463. The cubic root of 2081779 is about 127.6864681553.

The spelling of 2081779 in words is "two million, eighty-one thousand, seven hundred seventy-nine".