263791 has 4 divisors (see below), whose sum is σ = 287784. Its totient is φ = 239800.

The previous prime is 263761. The next prime is 263803. The reversal of 263791 is 197362.

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

It is not a de Polignac number, because 263791 - 2⁵ = 263759 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 (263761) 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, 11980 + ... + 12001.

It is an arithmetic number, because the mean of its divisors is an integer number (71946).

2²⁶³⁷⁹¹ is an apocalyptic number.

263791 is a deficient number, since it is larger than the sum of its proper divisors (23993).

263791 is a wasteful number, since it uses less digits than its factorization.

263791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23992.

The product of its digits is 2268, while the sum is 28.

The square root of 263791 is about 513.6058800286. The cubic root of 263791 is about 64.1337534773.

The spelling of 263791 in words is "two hundred sixty-three thousand, seven hundred ninety-one".