193150721 has 2 divisors, whose sum is σ = 193150722. Its totient is φ = 193150720.

The previous prime is 193150717. The next prime is 193150807. The reversal of 193150721 is 127051391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178596496 + 14554225 = 13364^2 + 3815^2 .

It is an emirp because it is prime and its reverse (127051391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 193150721 - 2² = 193150717 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (193150421) 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, 96575360 + 96575361.

It is an arithmetic number, because the mean of its divisors is an integer number (96575361).

Almost surely, 2^193150721 is an apocalyptic number.

It is an amenable number.

193150721 is a deficient number, since it is larger than the sum of its proper divisors (1).

193150721 is an equidigital number, since it uses as much as digits as its factorization.

193150721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1890, while the sum is 29.

The square root of 193150721 is about 13897.8674982891. The cubic root of 193150721 is about 578.0500519389.

The spelling of 193150721 in words is "one hundred ninety-three million, one hundred fifty thousand, seven hundred twenty-one".