261775 has 12 divisors (see below), whose sum is σ = 334552. Its totient is φ = 203040.

The previous prime is 261773. The next prime is 261787. The reversal of 261775 is 577162.

It is not a de Polignac number, because 261775 - 2¹ = 261773 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 784 + ... + 1066.

2²⁶¹⁷⁷⁵ is an apocalyptic number.

261775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

261775 is a deficient number, since it is larger than the sum of its proper divisors (72777).

261775 is a wasteful number, since it uses less digits than its factorization.

261775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330 (or 325 counting only the distinct ones).

The product of its digits is 2940, while the sum is 28.

The square root of 261775 is about 511.6395215384. The cubic root of 261775 is about 63.9699566021.

The spelling of 261775 in words is "two hundred sixty-one thousand, seven hundred seventy-five".