261056 has 14 divisors (see below), whose sum is σ = 518160. Its totient is φ = 130496.

The previous prime is 261043. The next prime is 261059. The reversal of 261056 is 650162.

261056 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261059) by changing a digit.

261056 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 1976 + ... + 2103.

2²⁶¹⁰⁵⁶ is an apocalyptic number.

It is an amenable number.

261056 is a deficient number, since it is larger than the sum of its proper divisors (257104).

261056 is an equidigital number, since it uses as much as digits as its factorization.

261056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4091 (or 4081 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 261056 is about 510.9363952587. The cubic root of 261056 is about 63.9113355559.

The spelling of 261056 in words is "two hundred sixty-one thousand, fifty-six".