261475 has 6 divisors (see below), whose sum is σ = 324260. Its totient is φ = 209160.

The previous prime is 261467. The next prime is 261509. The reversal of 261475 is 574162.

It is not a de Polignac number, because 261475 - 2³ = 261467 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 10459 = 261475 / (2 + 6 + 1 + 4 + 7 + 5).

It is a d-powerful number, because it can be written as 2⁷ + 6² + 4⁸ + 1 + 7⁶ + 5⁷ .

It is a nialpdrome in base 8.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5205 + ... + 5254.

2²⁶¹⁴⁷⁵ is an apocalyptic number.

261475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

261475 is a deficient number, since it is larger than the sum of its proper divisors (62785).

261475 is a wasteful number, since it uses less digits than its factorization.

261475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10469 (or 10464 counting only the distinct ones).

The product of its digits is 1680, while the sum is 25.

The square root of 261475 is about 511.3462623311. The cubic root of 261475 is about 63.9455102611.

The spelling of 261475 in words is "two hundred sixty-one thousand, four hundred seventy-five".