263891 has 12 divisors (see below), whose sum is σ = 301752. Its totient is φ = 229824.

The previous prime is 263881. The next prime is 263899. The reversal of 263891 is 198362.

It is not a de Polignac number, because 263891 - 2⁶ = 263827 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 (263899) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6116 + ... + 6158.

It is an arithmetic number, because the mean of its divisors is an integer number (25146).

2²⁶³⁸⁹¹ is an apocalyptic number.

263891 is a deficient number, since it is larger than the sum of its proper divisors (37861).

263891 is a wasteful number, since it uses less digits than its factorization.

263891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 79 counting only the distinct ones).

The product of its digits is 2592, while the sum is 29.

The square root of 263891 is about 513.7032217146. The cubic root of 263891 is about 64.1418565653.

The spelling of 263891 in words is "two hundred sixty-three thousand, eight hundred ninety-one".