261263 has 4 divisors (see below), whose sum is σ = 265608. Its totient is φ = 256920.

The previous prime is 261251. The next prime is 261271. The reversal of 261263 is 362162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 362162 = 2 ⋅181081.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261223) 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 3 ways as a sum of consecutive naturals, for example, 2081 + ... + 2202.

It is an arithmetic number, because the mean of its divisors is an integer number (66402).

2²⁶¹²⁶³ is an apocalyptic number.

261263 is a deficient number, since it is larger than the sum of its proper divisors (4345).

261263 is an equidigital number, since it uses as much as digits as its factorization.

261263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4344.

The product of its digits is 432, while the sum is 20.

The square root of 261263 is about 511.1389243640. The cubic root of 261263 is about 63.9282235688.

The spelling of 261263 in words is "two hundred sixty-one thousand, two hundred sixty-three".