261255 has 8 divisors (see below), whose sum is σ = 418032. Its totient is φ = 139328.

The previous prime is 261251. The next prime is 261271. The reversal of 261255 is 552162.

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 261255 - 2² = 261251 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 261255.

It is not an unprimeable number, because it can be changed into a prime (261251) 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, 8694 + ... + 8723.

It is an arithmetic number, because the mean of its divisors is an integer number (52254).

2²⁶¹²⁵⁵ is an apocalyptic number.

261255 is a deficient number, since it is larger than the sum of its proper divisors (156777).

261255 is a wasteful number, since it uses less digits than its factorization.

261255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17425.

The product of its digits is 600, while the sum is 21.

The square root of 261255 is about 511.1310986430. The cubic root of 261255 is about 63.9275710577.

The spelling of 261255 in words is "two hundred sixty-one thousand, two hundred fifty-five".