2807561 has 2 divisors, whose sum is σ = 2807562. Its totient is φ = 2807560.

The previous prime is 2807551. The next prime is 2807591. The reversal of 2807561 is 1657082.

2807561 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., 2805625 + 1936 = 1675^2 + 44^2 .

It is a cyclic number.

It is not a de Polignac number, because 2807561 - 2¹⁰ = 2806537 is a prime.

It is not a weakly prime, because it can be changed into another prime (2807521) 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, 1403780 + 1403781.

It is an arithmetic number, because the mean of its divisors is an integer number (1403781).

2^2807561 is an apocalyptic number.

It is an amenable number.

2807561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2807561 is an equidigital number, since it uses as much as digits as its factorization.

2807561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 2807561 is about 1675.5778107865. The cubic root of 2807561 is about 141.0727287723.

The spelling of 2807561 in words is "two million, eight hundred seven thousand, five hundred sixty-one".