2207561 has 2 divisors, whose sum is σ = 2207562. Its totient is φ = 2207560.

The previous prime is 2207549. The next prime is 2207581. The reversal of 2207561 is 1657022.

2207561 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., 2190400 + 17161 = 1480^2 + 131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2207561 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2207581) 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, 1103780 + 1103781.

It is an arithmetic number, because the mean of its divisors is an integer number (1103781).

2^2207561 is an apocalyptic number.

It is an amenable number.

2207561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2207561 is an equidigital number, since it uses as much as digits as its factorization.

2207561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 2207561 is about 1485.7863238030. The cubic root of 2207561 is about 130.2079708633.

The spelling of 2207561 in words is "two million, two hundred seven thousand, five hundred sixty-one".