194505009641 has 2 divisors, whose sum is σ = 194505009642. Its totient is φ = 194505009640.

The previous prime is 194505009599. The next prime is 194505009767. The reversal of 194505009641 is 146900505491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178228353241 + 16276656400 = 422171^2 + 127580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194505009641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 194505009592 and 194505009601.

It is not a weakly prime, because it can be changed into another prime (194505009541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97252504820 + 97252504821.

It is an arithmetic number, because the mean of its divisors is an integer number (97252504821).

Almost surely, 2^194505009641 is an apocalyptic number.

It is an amenable number.

194505009641 is a deficient number, since it is larger than the sum of its proper divisors (1).

194505009641 is an equidigital number, since it uses as much as digits as its factorization.

194505009641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 194505009641 in words is "one hundred ninety-four billion, five hundred five million, nine thousand, six hundred forty-one".