263161 has 4 divisors (see below), whose sum is σ = 265972. Its totient is φ = 260352.

The previous prime is 263129. The next prime is 263167. The reversal of 263161 is 161362.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161362 = 2 ⋅80681.

It can be written as a sum of positive squares in 2 ways, for example, as 207936 + 55225 = 456^2 + 235^2 .

It is a cyclic number.

It is not a de Polignac number, because 263161 - 2⁵ = 263129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263167) 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, 1260 + ... + 1453.

It is an arithmetic number, because the mean of its divisors is an integer number (66493).

2²⁶³¹⁶¹ is an apocalyptic number.

It is an amenable number.

263161 is a deficient number, since it is larger than the sum of its proper divisors (2811).

263161 is an equidigital number, since it uses as much as digits as its factorization.

263161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2810.

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

The square root of 263161 is about 512.9922026698. The cubic root of 263161 is about 64.0826568734.

It can be divided in two parts, 263 and 161, that added together give a palindrome (424).

The spelling of 263161 in words is "two hundred sixty-three thousand, one hundred sixty-one".