69809 has 2 divisors, whose sum is σ = 69810. Its totient is φ = 69808.

The previous prime is 69779. The next prime is 69821. The reversal of 69809 is 90896.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67600 + 2209 = 260^2 + 47^2 .

It is a cyclic number.

It is not a de Polignac number, because 69809 - 2¹² = 65713 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 69809.

It is not a weakly prime, because it can be changed into another prime (69829) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34904 + 34905.

It is an arithmetic number, because the mean of its divisors is an integer number (34905).

2⁶⁹⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

69809 is a deficient number, since it is larger than the sum of its proper divisors (1).

69809 is an equidigital number, since it uses as much as digits as its factorization.

69809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 69809 is about 264.2139284746. The cubic root of 69809 is about 41.1753347826.

It can be divided in two parts, 69 and 809, that added together give a palindrome (878).

The spelling of 69809 in words is "sixty-nine thousand, eight hundred nine".