134193821 has 2 divisors, whose sum is σ = 134193822. Its totient is φ = 134193820.

The previous prime is 134193811. The next prime is 134193833. The reversal of 134193821 is 128391431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114789796 + 19404025 = 10714^2 + 4405^2 .

It is a cyclic number.

It is not a de Polignac number, because 134193821 - 2⁶ = 134193757 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (134193811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67096910 + 67096911.

It is an arithmetic number, because the mean of its divisors is an integer number (67096911).

Almost surely, 2^134193821 is an apocalyptic number.

It is an amenable number.

134193821 is a deficient number, since it is larger than the sum of its proper divisors (1).

134193821 is an equidigital number, since it uses as much as digits as its factorization.

134193821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 134193821 is about 11584.2056697902. The cubic root of 134193821 is about 511.9695988724.

The spelling of 134193821 in words is "one hundred thirty-four million, one hundred ninety-three thousand, eight hundred twenty-one".