261485 has 16 divisors (see below), whose sum is σ = 371712. Its totient is φ = 172800.

The previous prime is 261467. The next prime is 261509. The reversal of 261485 is 584162.

261485 is nontrivially palindromic in base 15.

It is not a de Polignac number, because 261485 - 2⁸ = 261229 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 965 + ... + 1205.

It is an arithmetic number, because the mean of its divisors is an integer number (23232).

2²⁶¹⁴⁸⁵ is an apocalyptic number.

It is an amenable number.

261485 is a deficient number, since it is larger than the sum of its proper divisors (110227).

261485 is a wasteful number, since it uses less digits than its factorization.

261485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284.

The product of its digits is 1920, while the sum is 26.

The square root of 261485 is about 511.3560403476. The cubic root of 261485 is about 63.9463254403.

The spelling of 261485 in words is "two hundred sixty-one thousand, four hundred eighty-five".