2722661 has 2 divisors, whose sum is σ = 2722662. Its totient is φ = 2722660.

The previous prime is 2722639. The next prime is 2722691. The reversal of 2722661 is 1662272.

2722661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2660161 + 62500 = 1631^2 + 250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2722661 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2722661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2722691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1361330 + 1361331.

It is an arithmetic number, because the mean of its divisors is an integer number (1361331).

2^2722661 is an apocalyptic number.

It is an amenable number.

2722661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2722661 is an equidigital number, since it uses as much as digits as its factorization.

2722661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 26.

The square root of 2722661 is about 1650.0487871575. The cubic root of 2722661 is about 139.6361470203.

The spelling of 2722661 in words is "two million, seven hundred twenty-two thousand, six hundred sixty-one".