2665261 has 2 divisors, whose sum is σ = 2665262. Its totient is φ = 2665260.

The previous prime is 2665253. The next prime is 2665291. The reversal of 2665261 is 1625662.

2665261 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., 2621161 + 44100 = 1619^2 + 210^2 .

It is a cyclic number.

It is not a de Polignac number, because 2665261 - 2³ = 2665253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2665231) 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, 1332630 + 1332631.

It is an arithmetic number, because the mean of its divisors is an integer number (1332631).

2^2665261 is an apocalyptic number.

It is an amenable number.

2665261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2665261 is an equidigital number, since it uses as much as digits as its factorization.

2665261 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 2665261 is about 1632.5627093622. The cubic root of 2665261 is about 138.6478847168.

It can be divided in two parts, 2665 and 261, that added together give a triangular number (2926 = T₇₆).

The spelling of 2665261 in words is "two million, six hundred sixty-five thousand, two hundred sixty-one".