2566261 has 2 divisors, whose sum is σ = 2566262. Its totient is φ = 2566260.

The previous prime is 2566259. The next prime is 2566279. The reversal of 2566261 is 1626652.

2566261 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., 2102500 + 463761 = 1450^2 + 681^2 .

It is a cyclic number.

It is not a de Polignac number, because 2566261 - 2¹ = 2566259 is a prime.

Together with 2566259, it forms a pair of twin primes.

It is equal to p₁₈₇₅₆₁ and since 2566261 and 187561 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2566241) 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, 1283130 + 1283131.

It is an arithmetic number, because the mean of its divisors is an integer number (1283131).

2^2566261 is an apocalyptic number.

It is an amenable number.

2566261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2566261 is an equidigital number, since it uses as much as digits as its factorization.

2566261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 28.

The square root of 2566261 is about 1601.9553676679. The cubic root of 2566261 is about 136.9095074343.

The spelling of 2566261 in words is "two million, five hundred sixty-six thousand, two hundred sixty-one".