194531189 has 2 divisors, whose sum is σ = 194531190. Its totient is φ = 194531188.

The previous prime is 194531179. The next prime is 194531219. The reversal of 194531189 is 981135491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160402225 + 34128964 = 12665^2 + 5842^2 .

It is a cyclic number.

It is not a de Polignac number, because 194531189 - 2⁴ = 194531173 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194531179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97265594 + 97265595.

It is an arithmetic number, because the mean of its divisors is an integer number (97265595).

Almost surely, 2^194531189 is an apocalyptic number.

It is an amenable number.

194531189 is a deficient number, since it is larger than the sum of its proper divisors (1).

194531189 is an equidigital number, since it uses as much as digits as its factorization.

194531189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 41.

The square root of 194531189 is about 13947.4438159829. The cubic root of 194531189 is about 579.4239117360.

The spelling of 194531189 in words is "one hundred ninety-four million, five hundred thirty-one thousand, one hundred eighty-nine".