194273389 has 2 divisors, whose sum is σ = 194273390. Its totient is φ = 194273388.

The previous prime is 194273381. The next prime is 194273413. The reversal of 194273389 is 983372491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171872100 + 22401289 = 13110^2 + 4733^2 .

It is an emirp because it is prime and its reverse (983372491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194273389 - 2³ = 194273381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194273381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97136694 + 97136695.

It is an arithmetic number, because the mean of its divisors is an integer number (97136695).

Almost surely, 2^194273389 is an apocalyptic number.

It is an amenable number.

194273389 is a deficient number, since it is larger than the sum of its proper divisors (1).

194273389 is an equidigital number, since it uses as much as digits as its factorization.

194273389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 46.

The square root of 194273389 is about 13938.1989152114. The cubic root of 194273389 is about 579.1678405120.

The spelling of 194273389 in words is "one hundred ninety-four million, two hundred seventy-three thousand, three hundred eighty-nine".