261115 has 4 divisors (see below), whose sum is σ = 313344. Its totient is φ = 208888.

The previous prime is 261101. The next prime is 261127. The reversal of 261115 is 511162.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261115 - 2⁷ = 260987 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26107 + ... + 26116.

It is an arithmetic number, because the mean of its divisors is an integer number (78336).

261115 is a Friedman number, since it can be written as (511*1)^2-6, using all its digits and the basic arithmetic operations.

2²⁶¹¹¹⁵ is an apocalyptic number.

261115 is a deficient number, since it is larger than the sum of its proper divisors (52229).

261115 is an equidigital number, since it uses as much as digits as its factorization.

261115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52228.

The product of its digits is 60, while the sum is 16.

The square root of 261115 is about 510.9941291248. The cubic root of 261115 is about 63.9161499569.

Adding to 261115 its reverse (511162), we get a palindrome (772277).

Subtracting 261115 from its reverse (511162), we obtain a cube (250047 = 63³).

The spelling of 261115 in words is "two hundred sixty-one thousand, one hundred fifteen".