194563729 has 2 divisors, whose sum is σ = 194563730. Its totient is φ = 194563728.

The previous prime is 194563727. The next prime is 194563741. The reversal of 194563729 is 927365491.

It is a happy number.

194563729 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., 146289025 + 48274704 = 12095^2 + 6948^2 .

It is a cyclic number.

It is not a de Polignac number, because 194563729 - 2¹ = 194563727 is a prime.

Together with 194563727, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (194563727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97281864 + 97281865.

It is an arithmetic number, because the mean of its divisors is an integer number (97281865).

Almost surely, 2^194563729 is an apocalyptic number.

It is an amenable number.

194563729 is a deficient number, since it is larger than the sum of its proper divisors (1).

194563729 is an equidigital number, since it uses as much as digits as its factorization.

194563729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 46.

The square root of 194563729 is about 13948.6102892009. The cubic root of 194563729 is about 579.4562174432.

The spelling of 194563729 in words is "one hundred ninety-four million, five hundred sixty-three thousand, seven hundred twenty-nine".