263281 has 4 divisors (see below), whose sum is σ = 274752. Its totient is φ = 251812.

The previous prime is 263273. The next prime is 263287. The reversal of 263281 is 182362.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 263281 - 2³ = 263273 is a prime.

It is a super-2 number, since 2×263281² = 138633769922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263287) 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, 5701 + ... + 5746.

It is an arithmetic number, because the mean of its divisors is an integer number (68688).

2²⁶³²⁸¹ is an apocalyptic number.

It is an amenable number.

263281 is a deficient number, since it is larger than the sum of its proper divisors (11471).

263281 is a wasteful number, since it uses less digits than its factorization.

263281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11470.

The product of its digits is 576, while the sum is 22.

The square root of 263281 is about 513.1091501815. The cubic root of 263281 is about 64.0923958422.

The spelling of 263281 in words is "two hundred sixty-three thousand, two hundred eighty-one".