2660261 has 4 divisors (see below), whose sum is σ = 2664300. Its totient is φ = 2656224.

The previous prime is 2660237. The next prime is 2660291. The reversal of 2660261 is 1620662.

2660261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1515361 + 1144900 = 1231^2 + 1070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2660261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2660291) 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 in 3 ways as a sum of consecutive naturals, for example, 776 + ... + 2433.

It is an arithmetic number, because the mean of its divisors is an integer number (666075).

2^2660261 is an apocalyptic number.

It is an amenable number.

2660261 is a deficient number, since it is larger than the sum of its proper divisors (4039).

2660261 is an equidigital number, since it uses as much as digits as its factorization.

2660261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4038.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 2660261 is about 1631.0306557511. The cubic root of 2660261 is about 138.5611298137.

The spelling of 2660261 in words is "two million, six hundred sixty thousand, two hundred sixty-one".