194320891 has 2 divisors, whose sum is σ = 194320892. Its totient is φ = 194320890.

The previous prime is 194320879. The next prime is 194320901. The reversal of 194320891 is 198023491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 194320891 - 2¹⁵ = 194288123 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 194320891.

It is not a weakly prime, because it can be changed into another prime (194320801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97160445 + 97160446.

It is an arithmetic number, because the mean of its divisors is an integer number (97160446).

Almost surely, 2^194320891 is an apocalyptic number.

194320891 is a deficient number, since it is larger than the sum of its proper divisors (1).

194320891 is an equidigital number, since it uses as much as digits as its factorization.

194320891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 194320891 is about 13939.9028332338. The cubic root of 194320891 is about 579.2150409870.

The spelling of 194320891 in words is "one hundred ninety-four million, three hundred twenty thousand, eight hundred ninety-one".