219193993 has 2 divisors, whose sum is σ = 219193994. Its totient is φ = 219193992.

The previous prime is 219193981. The next prime is 219194011. The reversal of 219193993 is 399391912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172449424 + 46744569 = 13132^2 + 6837^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-219193993 is a prime.

It is not a weakly prime, because it can be changed into another prime (219193943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109596996 + 109596997.

It is an arithmetic number, because the mean of its divisors is an integer number (109596997).

Almost surely, 2^219193993 is an apocalyptic number.

It is an amenable number.

219193993 is a deficient number, since it is larger than the sum of its proper divisors (1).

219193993 is an equidigital number, since it uses as much as digits as its factorization.

219193993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 118098, while the sum is 46.

The square root of 219193993 is about 14805.2015521573. The cubic root of 219193993 is about 602.9429424747.

The spelling of 219193993 in words is "two hundred nineteen million, one hundred ninety-three thousand, nine hundred ninety-three".