219138197 has 2 divisors, whose sum is σ = 219138198. Its totient is φ = 219138196.

The previous prime is 219138149. The next prime is 219138209. The reversal of 219138197 is 791831912.

It is a happy number.

219138197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216855076 + 2283121 = 14726^2 + 1511^2 .

It is a cyclic number.

It is not a de Polignac number, because 219138197 - 2⁶ = 219138133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (219138107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109569098 + 109569099.

It is an arithmetic number, because the mean of its divisors is an integer number (109569099).

Almost surely, 2^219138197 is an apocalyptic number.

It is an amenable number.

219138197 is a deficient number, since it is larger than the sum of its proper divisors (1).

219138197 is an equidigital number, since it uses as much as digits as its factorization.

219138197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 41.

The square root of 219138197 is about 14803.3170944893. The cubic root of 219138197 is about 602.8917782695.

The spelling of 219138197 in words is "two hundred nineteen million, one hundred thirty-eight thousand, one hundred ninety-seven".