194889641 has 2 divisors, whose sum is σ = 194889642. Its totient is φ = 194889640.

The previous prime is 194889637. The next prime is 194889661. The reversal of 194889641 is 146988491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188238400 + 6651241 = 13720^2 + 2579^2 .

It is a cyclic number.

It is not a de Polignac number, because 194889641 - 2² = 194889637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 194889641.

It is not a weakly prime, because it can be changed into another prime (194889601) 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, 97444820 + 97444821.

It is an arithmetic number, because the mean of its divisors is an integer number (97444821).

Almost surely, 2^194889641 is an apocalyptic number.

It is an amenable number.

194889641 is a deficient number, since it is larger than the sum of its proper divisors (1).

194889641 is an equidigital number, since it uses as much as digits as its factorization.

194889641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 50.

The square root of 194889641 is about 13960.2879984619. The cubic root of 194889641 is about 579.7795843006.

The spelling of 194889641 in words is "one hundred ninety-four million, eight hundred eighty-nine thousand, six hundred forty-one".