261875 has 10 divisors (see below), whose sum is σ = 328020. Its totient is φ = 209000.

The previous prime is 261847. The next prime is 261881. The reversal of 261875 is 578162.

261875 is nontrivially palindromic in base 16.

It is not a de Polignac number, because 261875 - 2⁸ = 261619 is a prime.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 416 + ... + 834.

It is an arithmetic number, because the mean of its divisors is an integer number (32802).

2²⁶¹⁸⁷⁵ is an apocalyptic number.

261875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

261875 is a deficient number, since it is larger than the sum of its proper divisors (66145).

261875 is an frugal number, since it uses more digits than its factorization.

261875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439 (or 424 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 261875 is about 511.7372372615. The cubic root of 261875 is about 63.9781012317.

The spelling of 261875 in words is "two hundred sixty-one thousand, eight hundred seventy-five".