194239649 has 2 divisors, whose sum is σ = 194239650. Its totient is φ = 194239648.

The previous prime is 194239589. The next prime is 194239663. The reversal of 194239649 is 946932491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192321424 + 1918225 = 13868^2 + 1385^2 .

It is an emirp because it is prime and its reverse (946932491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194239649 - 2²⁰ = 193191073 is a prime.

It is not a weakly prime, because it can be changed into another prime (194239699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97119824 + 97119825.

It is an arithmetic number, because the mean of its divisors is an integer number (97119825).

Almost surely, 2^194239649 is an apocalyptic number.

It is an amenable number.

194239649 is a deficient number, since it is larger than the sum of its proper divisors (1).

194239649 is an equidigital number, since it uses as much as digits as its factorization.

194239649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 47.

The square root of 194239649 is about 13936.9885197628. The cubic root of 194239649 is about 579.1343100074.

The spelling of 194239649 in words is "one hundred ninety-four million, two hundred thirty-nine thousand, six hundred forty-nine".