261163 has 4 divisors (see below), whose sum is σ = 298480. Its totient is φ = 223848.

The previous prime is 261127. The next prime is 261167. The reversal of 261163 is 361162.

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 261163 - 2⁹ = 260651 is a prime.

It is a super-2 number, since 2×261163² = 136412225138, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261163.

It is not an unprimeable number, because it can be changed into a prime (261167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18648 + ... + 18661.

It is an arithmetic number, because the mean of its divisors is an integer number (74620).

2²⁶¹¹⁶³ is an apocalyptic number.

261163 is a deficient number, since it is larger than the sum of its proper divisors (37317).

261163 is an equidigital number, since it uses as much as digits as its factorization.

261163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37316.

The product of its digits is 216, while the sum is 19.

The square root of 261163 is about 511.0410942380. The cubic root of 261163 is about 63.9200662227.

Subtracting 261163 from its reverse (361162), we obtain a palindrome (99999).

It can be divided in two parts, 261 and 163, that added together give a palindrome (424).

The spelling of 261163 in words is "two hundred sixty-one thousand, one hundred sixty-three".