134178392809 has 2 divisors, whose sum is σ = 134178392810. Its totient is φ = 134178392808.

The previous prime is 134178392801. The next prime is 134178392819. The reversal of 134178392809 is 908293871431.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133807445209 + 370947600 = 365797^2 + 19260^2 .

It is a cyclic number.

It is not a de Polignac number, because 134178392809 - 2³ = 134178392801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 134178392809.

It is not a weakly prime, because it can be changed into another prime (134178392801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67089196404 + 67089196405.

It is an arithmetic number, because the mean of its divisors is an integer number (67089196405).

Almost surely, 2^134178392809 is an apocalyptic number.

It is an amenable number.

134178392809 is a deficient number, since it is larger than the sum of its proper divisors (1).

134178392809 is an equidigital number, since it uses as much as digits as its factorization.

134178392809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 134178392809 in words is "one hundred thirty-four billion, one hundred seventy-eight million, three hundred ninety-two thousand, eight hundred nine".