261171 has 16 divisors (see below), whose sum is σ = 410400. Its totient is φ = 163584.

The previous prime is 261169. The next prime is 261223. The reversal of 261171 is 171162.

It is not a de Polignac number, because 261171 - 2¹ = 261169 is a prime.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (261101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175 + ... + 743.

It is an arithmetic number, because the mean of its divisors is an integer number (25650).

2²⁶¹¹⁷¹ is an apocalyptic number.

261171 is a deficient number, since it is larger than the sum of its proper divisors (149229).

261171 is a wasteful number, since it uses less digits than its factorization.

261171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595 (or 589 counting only the distinct ones).

The product of its digits is 84, while the sum is 18.

The square root of 261171 is about 511.0489213373. The cubic root of 261171 is about 63.9207188870.

Subtracting from 261171 its reverse (171162), we obtain a palindrome (90009).

The spelling of 261171 in words is "two hundred sixty-one thousand, one hundred seventy-one".