193868321 has 2 divisors, whose sum is σ = 193868322. Its totient is φ = 193868320.

The previous prime is 193868317. The next prime is 193868359. The reversal of 193868321 is 123868391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146410000 + 47458321 = 12100^2 + 6889^2 .

It is a cyclic number.

It is not a de Polignac number, because 193868321 - 2² = 193868317 is a prime.

It is not a weakly prime, because it can be changed into another prime (193868021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96934160 + 96934161.

It is an arithmetic number, because the mean of its divisors is an integer number (96934161).

Almost surely, 2^193868321 is an apocalyptic number.

It is an amenable number.

193868321 is a deficient number, since it is larger than the sum of its proper divisors (1).

193868321 is an equidigital number, since it uses as much as digits as its factorization.

193868321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 41.

The square root of 193868321 is about 13923.6604741713. The cubic root of 193868321 is about 578.7650308408.

The spelling of 193868321 in words is "one hundred ninety-three million, eight hundred sixty-eight thousand, three hundred twenty-one".