263491 has 2 divisors, whose sum is σ = 263492. Its totient is φ = 263490.

The previous prime is 263489. The next prime is 263503. The reversal of 263491 is 194362.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 263491 - 2¹ = 263489 is a prime.

Together with 263489, it forms a pair of twin primes.

It is a d-powerful number, because it can be written as 2⁵ + 6⁴ + 4⁹ + 3² + 9 + 1 .

It is a nialpdrome in base 15.

It is not a weakly prime, because it can be changed into another prime (263401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131745 + 131746.

It is an arithmetic number, because the mean of its divisors is an integer number (131746).

2²⁶³⁴⁹¹ is an apocalyptic number.

263491 is a deficient number, since it is larger than the sum of its proper divisors (1).

263491 is an equidigital number, since it uses as much as digits as its factorization.

263491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 25.

The square root of 263491 is about 513.3137442150. The cubic root of 263491 is about 64.1094319192.

The spelling of 263491 in words is "two hundred sixty-three thousand, four hundred ninety-one".