261055 has 8 divisors (see below), whose sum is σ = 316800. Its totient is φ = 206496.

The previous prime is 261043. The next prime is 261059. The reversal of 261055 is 550162.

It is a happy number.

261055 is nontrivially palindromic in base 4.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261055 - 2⁹ = 260543 is a prime.

261055 is a lucky 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.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306 + ... + 784.

It is an arithmetic number, because the mean of its divisors is an integer number (39600).

2²⁶¹⁰⁵⁵ is an apocalyptic number.

261055 is a deficient number, since it is larger than the sum of its proper divisors (55745).

261055 is a wasteful number, since it uses less digits than its factorization.

261055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 261055 is about 510.9354166624. The cubic root of 261055 is about 63.9112539497.

It can be divided in two parts, 26 and 1055, that added together give a triangular number (1081 = T₄₆).

The spelling of 261055 in words is "two hundred sixty-one thousand, fifty-five".