63809 has 2 divisors, whose sum is σ = 63810. Its totient is φ = 63808.

The previous prime is 63803. The next prime is 63823. The reversal of 63809 is 90836.

It is a happy number.

63809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34225 + 29584 = 185^2 + 172^2 .

It is a cyclic number.

It is not a de Polignac number, because 63809 - 2⁴ = 63793 is a prime.

It is a Chen prime.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (63803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31904 + 31905.

It is an arithmetic number, because the mean of its divisors is an integer number (31905).

2⁶³⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

63809 is a deficient number, since it is larger than the sum of its proper divisors (1).

63809 is an equidigital number, since it uses as much as digits as its factorization.

63809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 63809 is about 252.6044338487. The cubic root of 63809 is about 39.9601686832.

The spelling of 63809 in words is "sixty-three thousand, eight hundred nine".