261211 has 8 divisors (see below), whose sum is σ = 280224. Its totient is φ = 242880.

The previous prime is 261169. The next prime is 261223. The reversal of 261211 is 112162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261211 - 2¹¹ = 259163 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261191 and 261200.

It is not an unprimeable number, because it can be changed into a prime (261241) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 805 + ... + 1081.

It is an arithmetic number, because the mean of its divisors is an integer number (35028).

2²⁶¹²¹¹ is an apocalyptic number.

261211 is a deficient number, since it is larger than the sum of its proper divisors (19013).

261211 is a wasteful number, since it uses less digits than its factorization.

261211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341.

The product of its digits is 24, while the sum is 13.

The square root of 261211 is about 511.0880550355. The cubic root of 261211 is about 63.9239820086.

Adding to 261211 its reverse (112162), we get a palindrome (373373).

The spelling of 261211 in words is "two hundred sixty-one thousand, two hundred eleven".