2722861 has 2 divisors, whose sum is σ = 2722862. Its totient is φ = 2722860.

The previous prime is 2722843. The next prime is 2722877. The reversal of 2722861 is 1682272.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2722500 + 361 = 1650^2 + 19^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2722861 is a prime.

2722861 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2722801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1361430 + 1361431.

It is an arithmetic number, because the mean of its divisors is an integer number (1361431).

2^2722861 is an apocalyptic number.

It is an amenable number.

2722861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2722861 is an equidigital number, since it uses as much as digits as its factorization.

2722861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 28.

The square root of 2722861 is about 1650.1093903133. The cubic root of 2722861 is about 139.6395660462.

The spelling of 2722861 in words is "two million, seven hundred twenty-two thousand, eight hundred sixty-one".