263609 has 2 divisors, whose sum is σ = 263610. Its totient is φ = 263608.

The previous prime is 263597. The next prime is 263611. The reversal of 263609 is 906362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156025 + 107584 = 395^2 + 328^2 .

It is a cyclic number.

It is not a de Polignac number, because 263609 - 2¹⁶ = 198073 is a prime.

Together with 263611, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (263009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131804 + 131805.

It is an arithmetic number, because the mean of its divisors is an integer number (131805).

2²⁶³⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

263609 is a deficient number, since it is larger than the sum of its proper divisors (1).

263609 is an equidigital number, since it uses as much as digits as its factorization.

263609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 263609 is about 513.4286708005. The cubic root of 263609 is about 64.1190006002.

The spelling of 263609 in words is "two hundred sixty-three thousand, six hundred nine".