194697440549 has 2 divisors, whose sum is σ = 194697440550. Its totient is φ = 194697440548.

The previous prime is 194697440453. The next prime is 194697440603. The reversal of 194697440549 is 945044796491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188371624324 + 6325816225 = 434018^2 + 79535^2 .

It is a cyclic number.

It is not a de Polignac number, because 194697440549 - 2¹⁶ = 194697375013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 194697440491 and 194697440500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194697445549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97348720274 + 97348720275.

It is an arithmetic number, because the mean of its divisors is an integer number (97348720275).

Almost surely, 2^194697440549 is an apocalyptic number.

It is an amenable number.

194697440549 is a deficient number, since it is larger than the sum of its proper divisors (1).

194697440549 is an equidigital number, since it uses as much as digits as its factorization.

194697440549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39191040, while the sum is 62.

The spelling of 194697440549 in words is "one hundred ninety-four billion, six hundred ninety-seven million, four hundred forty thousand, five hundred forty-nine".