193955009 has 2 divisors, whose sum is σ = 193955010. Its totient is φ = 193955008.

The previous prime is 193954973. The next prime is 193955053. The reversal of 193955009 is 900559391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187690000 + 6265009 = 13700^2 + 2503^2 .

It is a cyclic number.

It is not a de Polignac number, because 193955009 - 2²⁰ = 192906433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (193955609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96977504 + 96977505.

It is an arithmetic number, because the mean of its divisors is an integer number (96977505).

Almost surely, 2^193955009 is an apocalyptic number.

It is an amenable number.

193955009 is a deficient number, since it is larger than the sum of its proper divisors (1).

193955009 is an equidigital number, since it uses as much as digits as its factorization.

193955009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54675, while the sum is 41.

The square root of 193955009 is about 13926.7731007581. The cubic root of 193955009 is about 578.8512826955.

The spelling of 193955009 in words is "one hundred ninety-three million, nine hundred fifty-five thousand, nine".