194975789 has 2 divisors, whose sum is σ = 194975790. Its totient is φ = 194975788.

The previous prime is 194975779. The next prime is 194975791. The reversal of 194975789 is 987579491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98346889 + 96628900 = 9917^2 + 9830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194975789 is a prime.

Together with 194975791, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194975749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97487894 + 97487895.

It is an arithmetic number, because the mean of its divisors is an integer number (97487895).

Almost surely, 2^194975789 is an apocalyptic number.

It is an amenable number.

194975789 is a deficient number, since it is larger than the sum of its proper divisors (1).

194975789 is an equidigital number, since it uses as much as digits as its factorization.

194975789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5715360, while the sum is 59.

The square root of 194975789 is about 13963.3731239984. The cubic root of 194975789 is about 579.8649992971.

The spelling of 194975789 in words is "one hundred ninety-four million, nine hundred seventy-five thousand, seven hundred eighty-nine".