263381 has 4 divisors (see below), whose sum is σ = 278892. Its totient is φ = 247872.

The previous prime is 263369. The next prime is 263383. The reversal of 263381 is 183362.

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

It can be written as a sum of positive squares in 2 ways, for example, as 96100 + 167281 = 310^2 + 409^2 .

It is a cyclic number.

It is not a de Polignac number, because 263381 - 2¹⁸ = 1237 is a prime.

It is a super-2 number, since 2×263381² = 138739102322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7730 + ... + 7763.

It is an arithmetic number, because the mean of its divisors is an integer number (69723).

2²⁶³³⁸¹ is an apocalyptic number.

It is an amenable number.

263381 is a deficient number, since it is larger than the sum of its proper divisors (15511).

263381 is a wasteful number, since it uses less digits than its factorization.

263381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15510.

The product of its digits is 864, while the sum is 23.

The square root of 263381 is about 513.2065860840. The cubic root of 263381 is about 64.1005093892.

The spelling of 263381 in words is "two hundred sixty-three thousand, three hundred eighty-one".