134396809 has 2 divisors, whose sum is σ = 134396810. Its totient is φ = 134396808.

The previous prime is 134396803. The next prime is 134396813. The reversal of 134396809 is 908693431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93180409 + 41216400 = 9653^2 + 6420^2 .

It is an emirp because it is prime and its reverse (908693431) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-134396809 is a prime.

It is not a weakly prime, because it can be changed into another prime (134396803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67198404 + 67198405.

It is an arithmetic number, because the mean of its divisors is an integer number (67198405).

Almost surely, 2^134396809 is an apocalyptic number.

It is an amenable number.

134396809 is a deficient number, since it is larger than the sum of its proper divisors (1).

134396809 is an equidigital number, since it uses as much as digits as its factorization.

134396809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 134396809 is about 11592.9637711847. The cubic root of 134396809 is about 512.2276120660.

The spelling of 134396809 in words is "one hundred thirty-four million, three hundred ninety-six thousand, eight hundred nine".