194363989 has 2 divisors, whose sum is σ = 194363990. Its totient is φ = 194363988.

The previous prime is 194363963. The next prime is 194364011. The reversal of 194363989 is 989363491.

194363989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192238225 + 2125764 = 13865^2 + 1458^2 .

It is an emirp because it is prime and its reverse (989363491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194363989 - 2⁵ = 194363957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194363909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97181994 + 97181995.

It is an arithmetic number, because the mean of its divisors is an integer number (97181995).

Almost surely, 2^194363989 is an apocalyptic number.

It is an amenable number.

194363989 is a deficient number, since it is larger than the sum of its proper divisors (1).

194363989 is an equidigital number, since it uses as much as digits as its factorization.

194363989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1259712, while the sum is 52.

The square root of 194363989 is about 13941.4485976171. The cubic root of 194363989 is about 579.2578587620.

The spelling of 194363989 in words is "one hundred ninety-four million, three hundred sixty-three thousand, nine hundred eighty-nine".