2722561 has 2 divisors, whose sum is σ = 2722562. Its totient is φ = 2722560.

The previous prime is 2722553. The next prime is 2722591. The reversal of 2722561 is 1652272.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1640961 + 1081600 = 1281^2 + 1040^2 .

It is a cyclic number.

It is not a de Polignac number, because 2722561 - 2³ = 2722553 is a prime.

It is not a weakly prime, because it can be changed into another prime (2722541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1361280 + 1361281.

It is an arithmetic number, because the mean of its divisors is an integer number (1361281).

2^2722561 is an apocalyptic number.

It is an amenable number.

2722561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2722561 is an equidigital number, since it uses as much as digits as its factorization.

2722561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 25.

The square root of 2722561 is about 1650.0184847449. The cubic root of 2722561 is about 139.6344374446.

The spelling of 2722561 in words is "two million, seven hundred twenty-two thousand, five hundred sixty-one".